Nikken Kogaku Co., Ltd.

Nikken Kogaku Co., Ltd. is a Japanese civil-engineering company headquartered in Nishi-Shinjuku, Shinjuku, Tokyo. Founded in March 1964, it develops, manufactures and sells precast concrete products and construction methods for coastal, port, river and sabo (erosion-control) works. Its core business is the leasing of steel molds used to manufacture wave-dissipating and foundation-protection blocks, together with the sale of the resulting products, river revetment blocks, civil-engineering sheet materials and natural-stone products. The company's product range is organized around where and how the product is used: rivers, oceans, sabo works, roads and parks. Applications include drainage, mound covering, stockpiling, dams, training dikes, bed protection, retaining walls, root protection and bed protection, water-control works, wave dissipation, submerged dikes and artificial reefs, vertical and sloping wave-dissipating structures, jetties and headlands, gentle-slope dikes, revetment facing and stacking, breakwater inner-side reinforcement, tide embankment covering, stairs, offshore dikes, fish reefs and seaweed beds, and fishways. Flagship product families include the 3-ren Block, Grasp, Stone Block, Recta Guard, Lacuna IV, Coast JF/J, Diyar J and S types, Gyokai and Gyosho fish-related blocks, Stella Wall, Geo Rock, View Rock S, Green Terrace, Sachura, Nest-on, I-Ren Rock, Roba Rock, Neo Rock, Mega Coral, and the environmental-activated concrete line with products such as the eel habitat cage mat "Unasumi" and the abalone propagation plate "Ahami." Nikken Kogaku is listed on the Tokyo Stock Exchange Standard Market under securities code 9767; it was first listed in December 1984. Its capital is reported at 1,004,420,000 yen, with consolidated net sales of 5,115,000,000 yen for the fiscal year ended March 2025 and 136 consolidated employees as of March 2025. The company operates through group companies including Toyo Suiken Co., Ltd., Sansei Suiko Co., Ltd. and NK Kansai Kokken Co., Ltd., and opened a Hanoi office in Vietnam in 2012. In recent years the company has emphasized disaster prevention and reduction, climate-change adaptation, blue carbon and nature-positive initiatives. It participates in a NEDO Green Innovation Fund project on expanding blue-carbon ecosystems through a seaweed bank utilizing fishing ports, and its environmental-activated concrete work received the Japan Society of Civil Engineers Environmental Award in 2018. The company marked its 60th anniversary in 2024.

Nikken Kogaku Co., Ltd. was established on March 25, 1964, in Yotsuya 4-chome, Shinjuku, Tokyo. The company was founded to serve Japan's civil-engineering needs, particularly in coastal and river protection, at a time when the country was investing heavily in infrastructure and disaster prevention. In 1979 the company's shares were made public on the Tokyo over-the-counter market. In December 1984 the shares were listed on the Second Section of the Tokyo Stock Exchange. The company moved its head office to Nishi-Shinjuku 6-chome in 1995 and then to its current location in 2003. In 2004 Nikken Kogaku acquired shares in Toyo Suiken Co., Ltd., making it a subsidiary. In 2012 it opened a Hanoi office in Vietnam, reflecting a degree of overseas engagement. In 2013 a paper on the Subpreo Frame breakwater reinforcement method, titled "Breakwater reinforcement method against huge tsunamis," received the Young Professional Best Paper Award from the International Navigation Association (PIANC). In 2014 the company celebrated its 50th anniversary, and a paper on environmental-activated concrete received the second YP Award at the PIANC World Congress in San Francisco. In 2017 the company acquired shares in Sansei Suiko Co., Ltd., making it a subsidiary, and established NK Kansai Kokken Co., Ltd. as a wholly owned subsidiary. In 2018 its environmental-activated concrete initiative received the Environmental Award from the Japan Society of Civil Engineers for fiscal 2017. In 2019 it received the second JAPAN Construction International Award. In 2022 a paper on environmental-activated concrete received the second YP Award at PIANC Smart Rivers 2022 in Nanjing, and the company began work on a NEDO Green Innovation Fund project titled "Project to expand blue-carbon ecosystems through a seaweed bank utilizing fishing ports." In 2024 the company marked its 60th anniversary. Throughout its history, Nikken Kogaku has focused on developing and disseminating new technologies and construction methods that balance disaster prevention with environmental harmony. Its product portfolio has expanded from wave-dissipating and foundation-protection blocks to revetment blocks, civil-engineering sheets, natural-stone products and environmental-activated concrete for marine habitat restoration. The company has also pursued blue-carbon and nature-positive initiatives, positioning itself as a contributor to sustainable social infrastructure.

• 2024

  Celebrated 60th anniversary.

• 2022

  Environmental-activated concrete paper received second YP Award at PIANC Smart Rivers 2022 in Nanjing; began NEDO Green Innovation Fund project on blue-carbon ecosystems.

• 2019

  Received the second JAPAN Construction International Award.

• 2018

  Environmental-activated concrete initiative received the Japan Society of Civil Engineers Environmental Award for fiscal 2017.

• 2017

  Acquired shares in Sansei Suiko Co., Ltd.; established NK Kansai Kokken Co., Ltd. as a wholly owned subsidiary.

• 2014

  Celebrated 50th anniversary; environmental-activated concrete paper received second YP Award at PIANC World Congress in San Francisco.

• 2013

  Paper on Subpreo Frame received PIANC Young Professional Best Paper Award.

• 2012

  Opened Hanoi office in Vietnam.

• 2004

  Acquired shares in Toyo Suiken Co., Ltd., making it a subsidiary.

• 2003

  Head office moved to its current location.

• 1995

  Head office moved to Nishi-Shinjuku 6-chome.

• 1984

  Listed on the Second Section of the Tokyo Stock Exchange.

• 1979

  Shares made public on the Tokyo over-the-counter market.

• 1964

  Established in Yotsuya 4-chome, Shinjuku, Tokyo.

A specialist civil-engineering manufacturer focused on disaster prevention and reduction, harmonizing coastal and river infrastructure with the natural environment through precast concrete products, construction methods and blue-carbon initiatives.

• Wave-dissipating and foundation-protection block

  3-ren Block

• Wave-dissipating and foundation-protection block

  Grasp

• Wave-dissipating and foundation-protection block

  Stone Block

• Wave-dissipating and foundation-protection block

  Recta Guard

• Wave-dissipating and foundation-protection block

  Lacuna IV

• Wave-dissipating and foundation-protection block

  Coast JF

• Wave-dissipating and foundation-protection block

  Coast J

• Wave-dissipating and foundation-protection block

  Diyar J type

• Wave-dissipating and foundation-protection block

  Diyar S type

• Fish-related block

  Gyokai

• Fish-related block

  Gyosho

• Revetment block

  Stella Wall

• Revetment block

  Geo Rock

• Revetment block

  View Rock S

• Revetment block

  Green Terrace

• Revetment block

  Sachura

• Revetment block

  Nest-on

• Revetment block

  I-Ren Rock

• Revetment block

  Roba Rock

• Revetment block

  Neo Rock

• Revetment block

  Mega Coral

• Environmental concrete

  Environmental-activated concrete

• Environmental concrete

  Unasumi (eel habitat cage mat)

• Environmental concrete

  Ahami (abalone propagation plate)

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3. 3企業情報 | 日建工学株式会社nikken-kogaku.co.jp
4. 4土木シート・線材製品 | 製品を探す | 日建工学株式会社nikken-kogaku.co.jp
5. 5Nikken Kogaku Co., Ltd. (Japan) - Wikidatawikidata.org