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IHI Corporation

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A Japanese engineering and heavy-industry group spanning energy, aerospace, space, defense, social infrastructure, industrial machinery, and transportation systems.

Last updated November 4, 2026

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Overview

IHI Corporation is a Japanese engineering and heavy-industry group whose origins date to the establishment of Ishikawajima Shipyard in Tokyo in 1853. Created during the final years of the Tokugawa shogunate in response to the military and industrial challenge posed by Western powers, the shipyard became one of the foundations of Japan’s modern industrial base. The company later evolved through privatization, incorporation, mergers, diversification, and the development of specialized businesses in machinery, boilers, turbines, aircraft engines, space systems, transportation equipment, and infrastructure. The present company was formed in 1960 through the merger of Ishikawajima Heavy Industries and Harima Shipbuilding & Engineering. It operated for decades under the name Ishikawajima-Harima Heavy Industries, commonly abbreviated as IHI, before adopting IHI Corporation as its legal name in 2007. The name change reflected a strategic effort to present the group as an engineering and technology company rather than solely as a traditional hardware manufacturer. IHI’s business is organized around four broad areas. Resources, Energy & Environment covers utility boilers, gas turbines, diesel and gas engines, power-generation systems, process plants, nuclear-power equipment, energy storage, and emerging decarbonization technologies. The company has increasingly emphasized ammonia combustion, carbon capture and utilization, carbon recycling, methanation, green ammonia, and other technologies intended to support lower-carbon energy systems, while continuing to serve conventional power and industrial customers. Social Infrastructure includes bridges, watergates, shield tunneling systems, transportation systems, and related engineering services. IHI and its group companies have participated in the construction or engineering of major structures in Japan and overseas, including suspension bridges, long-span bridges, urban transport infrastructure, and large-scale civil-engineering projects. This business reflects the company’s historical ability to transfer shipbuilding skills in steel fabrication, welding, project management, and large-structure assembly to land-based infrastructure. Industrial Systems & General-Purpose Machinery includes automotive turbochargers, compressors, rotating machinery, logistics systems, mechanical parking systems, industrial equipment, heat-treatment services, surface-engineering technologies, and other machinery used in manufacturing and transportation. Through subsidiaries and joint ventures, IHI has maintained a presence in specialized industrial niches while periodically transferring, reorganizing, or divesting businesses that no longer fit its strategic priorities. Aero Engine, Space & Defense is one of IHI’s most technologically advanced fields. The group develops, manufactures, maintains, and supplies components for civil and military aircraft engines, often through international partnerships with companies such as GE Aerospace, Pratt & Whitney, and Rolls-Royce. It has also developed or produced domestic engines, rocket motors, launch-vehicle systems, solid rocket boosters, apogee motors, and other space hardware. Its aerospace operations support Japan’s civil aviation, defense, launch, exploration, and space-utilization programs. Shipbuilding was the original activity of the IHI group, but the business has been progressively separated, merged, and restructured. IHI’s former shipbuilding operations contributed to the creation of Japan Marine United, while subsequent industry consolidation led to the formation of Nihon Shipyard through cooperation between Japan Marine United and Imabari Shipbuilding. IHI remains connected to maritime engineering through marine machinery, propulsion systems, ship-related equipment, and its historical industrial assets. The company operates internationally through subsidiaries, joint ventures, technology partnerships, and overseas offices. Its customer base includes governments, utilities, airlines, defense organizations, infrastructure operators, industrial manufacturers, shipping companies, and engineering contractors. IHI’s competitive identity rests on the integration of advanced materials, combustion, rotating machinery, aerospace, structural engineering, project execution, and lifecycle maintenance capabilities. In the 2020s, IHI has combined strategic investment in decarbonization and aerospace with a renewed focus on compliance and quality governance. In 2024, misconduct involving engine test records at IHI Power Systems led to investigations, regulatory scrutiny, partial revocation of ISO 9001 certification for affected manufacturing scopes, customer compensation measures, and group-wide reforms. Other subsidiary-related issues involving snowplow specifications and mechanical parking systems further increased attention on internal controls. Despite these challenges, IHI remains an active, publicly listed Japanese industrial group with a broad technology portfolio and a strong historical connection to national infrastructure and advanced manufacturing.

History

IHI's history begins on December 5, 1853, when the Tokugawa shogunate ordered the Mito domain to establish Ishikawajima Shipyard in response to the arrival of Commodore Matthew Perry's fleet and the perceived need to strengthen Japan's industrial and naval capabilities. The yard was established on Ishikawajima, an island in the Sumida River area of present-day Tokyo. Its early role was closely connected to the modernization of Japanese shipbuilding and the development of domestic marine technology. In 1876, entrepreneur Tomiji Hirano leased the former government shipyard site and established Ishikawajima Hirano Shipyard, giving the enterprise a stronger private and commercial character. The yard became an important center for civil shipbuilding and industrial fabrication. In 1889, it was incorporated as Ishikawajima Shipbuilding & Engineering Co., Ltd. The company expanded beyond ships into engineering, machinery, steel structures, and other activities associated with Japan's industrialization. Harima Dock Co., Ltd. was established in 1907 in what is now Aioi, Hyogo Prefecture. It later became Harima Shipbuilding & Engineering Co., Ltd. The Ishikawajima group meanwhile broadened its portfolio. An aircraft-manufacturing company was established in 1924, while the automobile division was spun off in 1929 as Ishikawajima Automotive Works. That business eventually became part of the corporate lineage of Isuzu Motors through later mergers. The group also entered turbine and industrial-machinery manufacturing, including the establishment of Ishikawajima Shibaura Turbine with Shibaura Engineering Works in 1936. After the Second World War, the shipyard's corporate successor adopted the name Ishikawajima Heavy Industries Co., Ltd. in 1945. The postwar period saw a major expansion into heavy machinery, boilers, turbines, jet engines, transport equipment, and large industrial projects. In 1945, the group produced the Ne-20, described by IHI as Japan's first domestically manufactured turbojet engine. In 1957, the Tanashi Aero-Engine Plant opened as a facility specializing in jet engines, helping establish the technical foundation for later aerospace programs. The decisive corporate turning point came in 1960, when Ishikawajima Heavy Industries merged with Harima Shipbuilding & Engineering to create Ishikawajima-Harima Heavy Industries Co., Ltd., commonly known as IHI. The merger combined shipbuilding capacity with heavy machinery, industrial plant, energy, and engineering capabilities. During the 1960s and 1970s, IHI expanded manufacturing sites, merged with additional industrial companies, and developed capabilities in heavy containers, boilers, machinery, tunneling systems, and marine engineering. The group also participated in major national infrastructure and industrial projects, including early LNG storage and large-scale power equipment. Aerospace became an increasingly important area from the 1950s onward. IHI participated in Japanese aero-engine initiatives and in 1983 became part of International Aero Engines, the multinational consortium that developed the V2500 civil aircraft engine. The company subsequently became involved in joint engine programs with international partners, including GE Aerospace, Pratt & Whitney, and Rolls-Royce. These partnerships enabled IHI to combine domestic design, manufacturing, and maintenance expertise with global civil-aviation programs. IHI also reorganized its maritime and industrial businesses during the 1980s and 1990s. Its diesel-engine activities were separated into Diesel United, and in 1995 it established Marine United jointly with Sumitomo Heavy Industries. The company continued to build and support naval vessels, commercial ships, marine machinery, and maritime systems, although shipbuilding gradually became more structurally separate from the core IHI organization. In 2000, IHI acquired Nissan's aerospace and defense divisions and established IHI Aerospace, strengthening its position in rocket systems, space products, defense equipment, and aerospace manufacturing. In the early 2000s, the group reorganized its space activities, transportation businesses, power systems, and shipbuilding operations. The shipbuilding and offshore operations became IHI Marine United in 2002, while other businesses were placed in specialized subsidiaries and joint ventures. The company adopted the legal name IHI Corporation in 2007. The change was intended to reinforce IHI as a group-wide technology and engineering brand and to move beyond an identity centered on heavy hardware manufacturing. Around the same period, IHI rationalized several operations, created separate infrastructure and tunneling companies, and formed IHI Infrastructure Systems through the integration of bridge and watergate businesses with partner companies. The 2010s were characterized by portfolio restructuring and international partnerships. IHI separated energy and nuclear operations, established joint ventures for nuclear-turbine equipment and steelmaking machinery, acquired companies in telecommunications, heat treatment, coating, and boiler engineering, and transferred or reorganized selected businesses. In 2013, IHI Marine United merged with Universal Shipbuilding Corporation to establish Japan Marine United, with IHI retaining an ownership interest. The broader Japanese shipbuilding sector later consolidated further through the creation of Nihon Shipyard, in which Japan Marine United and Imabari Shipbuilding combined activities through a joint venture. In 2016, IHI sold its construction-machinery subsidiary to Kato Works. In 2018, it ended manufacturing of nuclear-reactor parts as it focused more heavily on aircraft components, while retaining nuclear engineering and plant-related capabilities. In 2019, IHI consolidated power-system-related activities into IHI Power Systems and integrated process-plant businesses into IHI Plant Services. These changes reflected a continuing effort to focus capital and management attention on aerospace, energy systems, infrastructure, industrial machinery, and high-value engineering. During the 2020s, IHI expanded civil aero-engine maintenance, continued work in rocket and space systems, and increased investment in ammonia combustion, carbon recycling, energy storage, and other decarbonization technologies. It also transferred or sold a number of businesses, including marine large engines, packaged boilers, turf-care machinery, materials-handling systems, construction materials, rail-related equipment, and other non-core operations. In 2026, IHI transferred its shares in Meisei Electric to Nohmi Bosai and its shares in Kotobuki Iron Works to Tsuneishi Iron Works. The period also brought serious compliance challenges. In 2024, a whistleblower report led to the discovery of improper alterations in engine test-operation records at IHI Power Systems. The issue involved marine and land-use engines and resulted in investigations by Japanese authorities, an independent special investigation committee, partial revocation of ISO 9001 certification for affected manufacturing scopes, customer compensation, and group-wide compliance reforms. Separate issues involving snowplow specifications at Niigata Transys and antitrust conduct in the mechanical parking business of IHI Transport Machinery further prompted corrective action. IHI's subsequent strategy has therefore combined technology development and business portfolio reform with efforts to strengthen quality assurance, internal reporting, management oversight, and organizational culture.

  • 2026

    Selected business interests are transferred

    [2]

    IHI transfers its shares in Meisei Electric to Nohmi Bosai and its shares in Kotobuki Iron Works to Tsuneishi Iron Works.

  • 2025

    Ammonia-fueled tugboat demonstration voyage is completed

    [9]

    A commercial-use ammonia-fueled tugboat completes a three-month demonstration voyage, supporting IHI's marine decarbonization strategy.

  • 2024

    Engine-test-record misconduct is disclosed

    [7]

    IHI reports improper alterations involving test-operation records for marine and land-use engines at IHI Power Systems, leading to government review, independent investigation, and corrective measures.

  • 2023

    Marine large-engine business is transferred

    [2]

    IHI transfers the marine large-engine business of IHI Power Systems to Mitsui E&S Holdings, continuing the group's portfolio reshaping.

  • 2021

    Civil aero-engine maintenance center begins operations

    [2]

    IHI begins operations at Tsurugashima Aero-Engine Works as a civil aero-engine maintenance center.

  • 2019

    IHI Power Systems is established

    [2]

    IHI integrates its power-systems business with Diesel United and Niigata Power Systems to create IHI Power Systems Co., Ltd.

  • 2018

    Nuclear-reactor-parts manufacturing is halted

    [10]

    IHI ends manufacturing of nuclear-reactor parts while continuing selected nuclear engineering and plant-related activities, with greater strategic emphasis placed on aircraft components.

  • 2016

    Construction machinery business is transferred

    [2]

    IHI transfers all shares of IHI Construction Machinery to Kato Works as part of portfolio rationalization.

  • 2013

    Japan Marine United is established

    [2]

    IHI Marine United merges with Universal Shipbuilding Corporation to create Japan Marine United, consolidating major Japanese shipbuilding assets.

  • 2009

    Infrastructure and industrial operations are reorganized

    [2]

    IHI reorganizes logistics, infrastructure, offshore, industrial-machinery, environmental-equipment, and rotating-machinery activities, including the creation of IHI Infrastructure Systems.

Products and positioning

A technology-intensive Japanese heavy-industry and engineering brand focused on complex infrastructure, aerospace, energy, defense, marine, and industrial systems. IHI combines long-cycle project execution with specialized manufacturing, systems integration, lifecycle services, and research in decarbonization and advanced propulsion.

  • Energy systems

    Gas turbines and power systems

    IHI supplies gas turbines, diesel engines, gas engines, cogeneration systems, combined-cycle systems, and related lifecycle services. Its portfolio includes LM2500 and LM6000 gas-turbine systems and equipment for land-based and marine applications. The business combines power-generation hardware with engineering, monitoring, maintenance, and efforts to reduce emissions through higher efficiency, dual-fuel operation, ammonia combustion, and other alternative-fuel technologies.

  • Energy and environmental equipment

    Utility boilers and carbon solutions

    IHI designs and supplies utility boilers, biomass and waste-fuel boiler systems, flue-gas equipment, and broader process-plant solutions. The business supports conventional power generation while also developing technologies related to carbon capture and utilization, carbon recycling, methanation, ammonia co-firing, and other pathways toward lower-carbon industrial energy systems.

  • Aerospace

    Aircraft engines and aero-engine components

    IHI develops, manufactures, maintains, and supplies aircraft engines and engine components for civil and defense programs. Some programs are developed internally, while others are conducted through international partnerships with GE Aerospace, Pratt & Whitney, Rolls-Royce, and other aerospace companies. IHI's capabilities include major structural components, engine modules, precision manufacturing, assembly, repair, and maintenance services.

  • Space systems

    Space launch and propulsion systems

    IHI's space portfolio includes sounding rockets, launch vehicles, solid rocket boosters, liquid-fuel apogee motors, and related propulsion technologies. Products and programs associated with the group include the M-V and Epsilon launch vehicles, the SRB-A booster used on Japan's H-IIA and H-IIB launch vehicles, and the BT-4 apogee motor used in commercial orbital missions.

  • Social infrastructure

    Bridges, watergates, and steel structures

    Through IHI Infrastructure Systems and related businesses, IHI designs and constructs bridges, watergates, steel structures, and infrastructure components. Its project history includes participation in major Japanese and overseas bridges such as the Akashi-Kaikyo Bridge, Tatara Bridge, Tokyo Bay Aqua-Line, Second Bosporus Bridge, Osman Gazi Bridge, Carquinez Bridge, Binh Bridge, and Braila Bridge.

  • Marine engineering · 1853

    Marine engines and marine systems

    Marine engineering is the historical foundation of IHI. The group has produced ships, marine diesel engines, dual-fuel engines, propulsion equipment, and naval-vessel systems. Although parts of the shipbuilding business were separated or consolidated into Japan Marine United and later maritime joint ventures, IHI remains connected to marine technologies through engines, industrial systems, ship-related equipment, and decarbonization projects such as ammonia-fueled vessels.

  • Rotating machinery

    Automotive turbochargers

    IHI develops and manufactures turbochargers for passenger vehicles, commercial vehicles, and other automotive applications. The business applies the group's expertise in high-speed rotating machinery, heat resistance, precision manufacturing, and engine-system integration. International subsidiaries and joint ventures have supported production and sales in major automotive markets.

  • Industrial machinery

    Industrial compressors and rotating machinery

    IHI supplies compressors, separation systems, rotating machinery, and related equipment for industrial plants and transportation applications. These products serve process industries, energy facilities, manufacturing operations, and marine customers. The business is supported by engineering, condition monitoring, maintenance, and lifecycle optimization capabilities.

  • Industrial and transportation systems

    Logistics and mechanical parking systems

    IHI's industrial-systems portfolio includes automated logistics equipment, materials-handling systems, transport machinery, and mechanical parking systems. These activities have been reorganized and transferred over time as the group has focused its portfolio. The businesses illustrate IHI's extension from heavy machinery into automation, urban mobility, and equipment used in distribution and built environments.

  • Nuclear energy

    Nuclear-power equipment and services

    IHI supplies selected nuclear-power equipment and participates in plant development, construction support, fuel-cycle back-end activities, safety improvements, and decommissioning. The company has reduced or ended certain manufacturing activities, including nuclear-reactor-parts production, but retains capabilities in key equipment, containment and pressure-related systems, piping, plant engineering, and support for existing and decommissioned facilities.

  • Energy transition

    Ammonia-fueled and decarbonization systems

    IHI is developing ammonia combustion for engines and power plants, green-ammonia production and supply-chain technologies, carbon recycling, methanation, energy storage, and electrification-related systems. Demonstrations include ammonia-fueled marine vessels and projects intended to use ammonia in existing industrial or power-generation assets. These offerings position the company toward lower-carbon infrastructure while leveraging its established combustion and plant-engineering expertise.

Controversies

  • 2025

    IHI Transport Machinery antitrust violation

    The Japan Fair Trade Commission determined that the mechanical parking-system business of IHI Transport Machinery had engaged in conduct violating the Antimonopoly Act. The subsidiary had applied for leniency and cooperated with the investigation, resulting in exemption from surcharges alongside a cease-and-desist order.

    Source

  • 2024

    IHI Power Systems engine test-record misconduct

    IHI disclosed that IHI Power Systems had improperly altered test-operation records for marine and land-use engines, including fuel-consumption-related data. The issue followed an internal report and led to investigations by Japanese authorities, an external special investigation committee, partial revocation of ISO 9001 certification for affected manufacturing scopes, customer communications, compensation measures, and group-wide compliance reforms.

    Source

  • 2024

    Niigata Transys snowplow specification issue

    IHI reported that certain road snowplows manufactured and sold by Niigata Transys had been delivered with specifications different from those presented to customers. IHI described investigations, comprehensive performance testing, customer responses, and recurrence-prevention actions.

    Source

Read more

Marketing campaigns

  • 2025Ammonia-fueled tugboat demonstration

    Japan

    IHI participated in the demonstration of a commercial-use ammonia-fueled tugboat. The project tested marine ammonia-fuel technology in operational conditions and connected IHI's engine, combustion, marine, and decarbonization capabilities.

    Outcome. The three-month demonstration voyage was completed, with IHI reporting greenhouse-gas reductions of up to approximately 95 percent for the demonstration activity.

    Source
  • 2024Embracing Complexity

    Global

    IHI launched a global corporate campaign built around the idea that complex social and environmental challenges require integrated technological and engineering responses. The campaign used corporate storytelling and generative-AI-related creative elements to present IHI as a technology group working across energy, infrastructure, aerospace, and industrial systems.

    Outcome. The campaign served as a global brand-positioning initiative intended to communicate IHI's technology-led identity and its vision of a society in which nature and technology work together.

    Source
  • 2024Green-ammonia and Power-to-X development

    Japan · Indonesia · Asia-Pacific

    IHI promoted a series of projects involving green-ammonia production, ammonia combustion, and conversion of renewable electricity into industrial heat and fuels. Activities included a green-ammonia production test using renewable energy and a study of green-ammonia combustion at an Indonesian coal-fired power plant.

    Outcome. The initiatives expanded IHI's public positioning in energy transition and demonstrated potential applications for ammonia and renewable-energy integration in existing infrastructure.

    Source

Brand decisions

  • 2025

    Advance ammonia-fueled marine technologyProduct launch

    Background

    Shipping and industrial customers are seeking lower-emission propulsion options, while IHI is developing ammonia combustion, marine engines, and related energy systems.

    Action taken

    IHI participated in the development and demonstration of a commercial-use ammonia-fueled tugboat and related marine decarbonization technologies.

    Aftermath

    The demonstration voyage was completed and positioned IHI as a participant in the emerging ammonia-fuel value chain for maritime transport.

    Source

  • 2025

    Continue portfolio transfers in non-core businessesM&A

    Background

    IHI's long-term strategy has included concentrating resources on aerospace, energy, infrastructure, industrial systems, and other priority technology areas.

    Action taken

    IHI transferred or agreed to transfer selected businesses and subsidiaries, including packaged boilers, turf-care machinery, materials-handling systems, construction materials, and rail-related equipment.

    Aftermath

    The transactions continued the group's portfolio rationalization and increased emphasis on businesses regarded as strategically central to IHI's future positioning.

    Source

  • 2024

    Initiate corrective action after engine-record misconductOther

    Background

    Improper alterations in test-operation records at IHI Power Systems created concerns about data integrity, customer specifications, certification, and the effectiveness of internal controls.

    Action taken

    IHI reported the matter to relevant authorities, commissioned an external special investigation, reviewed affected engines and records, communicated with customers, accepted certification consequences, and formulated measures covering compliance, quality assurance, reporting, training, personnel rotation, and organizational culture.

    Aftermath

    IHI Power Systems published investigation findings and later announced compensation for eligible customers. The group also established broader compliance initiatives, including a designated Compliance Day and strengthened oversight.

    Source

  • 2023

    Transfer the marine large-engine businessStrategy

    Background

    IHI continued to streamline its industrial portfolio and redefine the role of IHI Power Systems within the group's energy and machinery businesses.

    Action taken

    The marine large-engine business of IHI Power Systems was transferred to Mitsui E&S Holdings.

    Aftermath

    The transaction reduced IHI's direct involvement in large marine engines while allowing the group to focus on selected power, energy, aerospace, infrastructure, and industrial technologies.

    Source

  • 2019

    Consolidate power-systems operationsStrategy

    Background

    IHI operated power-system and engine activities through several related businesses, including its own power-systems unit, Diesel United, and Niigata Power Systems.

    Action taken

    IHI integrated the relevant businesses into IHI Power Systems Co., Ltd., creating a more unified platform for marine and land-use engines and power systems.

    Aftermath

    IHI Power Systems became the principal subsidiary for the consolidated activities, although it later became the subject of the 2024 engine-test-record misconduct investigation.

    Source

  • 2018

    End nuclear-reactor-parts manufacturingStrategy

    Background

    IHI reviewed its nuclear and aerospace portfolio and sought to concentrate manufacturing resources on areas with stronger strategic growth potential, particularly aircraft components.

    Action taken

    IHI halted manufacturing of nuclear-reactor parts while maintaining selected nuclear engineering, equipment, safety, and decommissioning activities.

    Aftermath

    Japan Steel Works became the sole Japanese supplier of certain reactor parts, while IHI placed greater emphasis on aerospace manufacturing and other technology businesses.

    Source

  • 2013

    Create Japan Marine UnitedM&A

    Background

    Japan's shipbuilding industry was undergoing consolidation, and IHI Marine United and Universal Shipbuilding Corporation operated overlapping shipbuilding capabilities.

    Action taken

    IHI Marine United merged with Universal Shipbuilding Corporation, a JFE Holdings company, to establish Japan Marine United Corporation.

    Aftermath

    The transaction created a larger Japanese shipbuilding group, while IHI retained an ownership interest and shifted its direct exposure to shipbuilding toward a shareholder and industrial-partner role.

    Source

  • 2007

    Adopt the IHI Corporation nameStrategy

    Background

    The group had operated under Ishikawajima-Harima Heavy Industries for decades while using IHI as a common abbreviation. Management sought a name that would support a unified global group identity and communicate engineering and technology capabilities rather than only hardware manufacturing.

    Action taken

    The company changed its legal name to IHI Corporation and promoted IHI as the shared brand for group companies.

    Aftermath

    The change reinforced IHI as the group's international corporate identity while preserving continuity with the Ishikawajima-Harima heritage.

    Source

Sources13 sources

  1. 1IHI Corporation official company profileihi.co.jp
  2. 2IHI official corporate historyihi.co.jp
  3. 3IHI official business outlineihi.co.jp
  4. 4IHI Resources, Energy & Environment businessihi.co.jp
  5. 5IHI official corporate officersihi.co.jp
  6. 6IHI compliance and business risks disclosureihi.co.jp
  7. 7IHI Power Systems engine-test-record investigation interim reportihi.co.jp
  8. 8IHI Power Systems compensation noticeihi.co.jp
  9. 9IHI official 2024 fiscal-year news archiveihi.co.jp
  10. 10IHI Corporation Wikipedia articleen.wikipedia.org
  11. 11Corporate name changes to IHI Corporationihi.co.jp
  12. 12Green-ammonia and Power-to-X developmentihi.co.jp
  13. 13Niigata Transys snowplow specification issueihi.co.jp

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