Marine Works Japan Ltd.
Japanese marine and earth science consultancy providing ocean surveys, sample analysis, and monitoring technology since 1979.
Last updated September 27, 2026
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Overview
Marine Works Japan Ltd. (株式会社マリン・ワーク・ジャパン) is a Japanese marine and earth science consultancy headquartered in Yokosuka, Kanagawa Prefecture. Founded in February 1979 as Nihon Shinkai Sangyo Co., Ltd. (日本深海産業株式会社), the company was renamed Marine Works Japan in August 1994. It describes itself as a "science and technology consultant for the sea and the earth," supporting clients in ocean science and geoscience through ocean surveys, sample analysis, and the design and fabrication of specialized equipment. The company's service portfolio spans metocean monitoring, environmental monitoring, seafloor topography and structure surveys, environmental impact assessments, observation buoy design and fabrication, ocean survey and observation, sample analysis, curation, and manufacturing. Its solution areas target offshore wind power, seafloor mineral resources, marine environment and sample analysis, and fishery resources and blue carbon. Marine Works Japan operates from offices in Yokosuka and Yokohama (Kanagawa), Mutsu (Aomori), Nago (Okinawa), and Nankoku (Kochi), and lists project locations across North America, South America, Oceania, Southeast Asia, South Asia, Africa, Europe, and Antarctica. The company has long-standing ties to Japan's national marine science infrastructure, having begun operations at JAMSTEC's Mutsu Institute in 1995, at the International Ocean Environmental Information Center in Nago in 2001, and at JAMSTEC's Kochi Core Institute in 2005. It obtained ISO 9001 certification in 2004 and updated to ISO 9001:2015 in 2018. Marine Works Japan remains a private company and is not listed on a stock exchange. Its corporate mission is to contribute to the sustainable development of society through activities that "know the sea" and "know the earth."
History
Marine Works Japan Ltd. was established in February 1979 as Nihon Shinkai Sangyo Co., Ltd. (日本深海産業株式会社), headquartered in Yokosuka, Kanagawa Prefecture. A Tokyo sales office was opened in March 1979 in Chuo-ku, Tokyo, and relocated to Chiyoda-ku in July 1981. The head office moved to Nishi-ku, Yokohama in June 1985, and then to Chiyoda-ku, Tokyo in August 1987. In August 1994, the company changed its name to Marine Works Japan Co., Ltd. (株式会社マリン・ワーク・ジャパン). The following year, in September 1995, it began operations at the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Mutsu Institute. In July 1997, the head office moved to Kanazawa-ku, Yokohama. In April 2001, the company began work at the International Ocean Environmental Information Center in Nago, Okinawa, and closed its Tokyo sales office in December of that year. The head office moved again within Kanazawa-ku, Yokohama in March 2004, and in December 2004 the company obtained ISO 9001:2000 certification (JUSE-RA-1097). In October 2005, Marine Works Japan began operations at JAMSTEC's Kochi Core Institute. The head office relocated to Yokosuka, Kanagawa Prefecture in October 2012. A Nago sales office was opened in Okinawa in August 2015, and in January 2018 the company obtained ISO 9001:2015 certification (JUSE-RA-2112). The Nago sales office was closed in March 2022. Throughout its history, the company has focused on ocean surveys, research, and development both in Japan and overseas, building expertise in marine science and geoscience services.
Nihon Shinkai Sangyo Co., Ltd. established in Yokosuka, Kanagawa.
Tokyo sales office opened in Chuo-ku, Tokyo.
Tokyo sales office relocated to Chiyoda-ku, Tokyo.
Head office relocated to Nishi-ku, Yokohama.
Head office relocated to Chiyoda-ku, Tokyo.
Company name changed to Marine Works Japan Co., Ltd.
Operations began at JAMSTEC Mutsu Institute.
Head office relocated to Kanazawa-ku, Yokohama.
Operations began at the International Ocean Environmental Information Center in Nago, Okinawa.
Tokyo sales office closed.
Products and positioning
Science and technology consultant for the sea and the earth, leading Japan's marine industry through service and product quality.
Automatic water sampling device
Developed as a manufacturing case study.
Sea condition automatic observation system
Designed as a manufacturing case study.
Pressure-resistant container with viewing window (Takatsuka-type)
Developed as a manufacturing case study.
Pressure test water tank
Developed as a manufacturing case study.
Floating LiDAR for offshore wind observation
Installed at sea as part of offshore wind power services.
Sources5 sources
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