Sumitomo Heavy Industries, Ltd.
Native name
Company typePublic (K.K)
TYO: 6302
Nikkei 225 Component
FoundedNovember 20, 1888; 135 years ago (1888-11-20)
HeadquartersThinkPark Tower, 2-1-1 Osaki, Shinagawa-ku, Tokyo, 141-6025 Japan
Area served
Key people
Shunsuke Betsukawa
(President and CEO)
RevenueIncrease $ 6.02 billion (FY 2014) (¥ 615.2 billion) (FY 2014)
Increase $ 175.3 million (FY 2014) (¥ 17.89 billion) (FY 2014)
Number of employees
17,941 (consolidated as of March 31, 2014)
WebsiteSumitomo Heavy Industries
Footnotes / references

Sumitomo Heavy Industries, Ltd. (住友重機械工業株式会社, Sumitomo Jūkikai Kōgyō Kabushiki-gaisha) (SHI) is an integrated manufacturer of industrial machinery, automatic weaponry, ships, bridges and steel structure, equipment for environmental protection, including recycling, power transmission equipment, plastic molding machines, laser processing systems, particle accelerators, material handling systems, cancer diagnostic and treatment equipment and others.[3]


In 1888, a company was formed to provide equipment repair services to the Besshi copper mine. Almost 50 years later, in 1934, the company incorporated as Sumitomo Machinery Co., Ltd. to manufacture machinery for the steel and transportation industries in support of that period of rapid economic growth.

In 1969, Sumitomo Machinery Co., Ltd. merged with Uraga Heavy Industries Co., Ltd. to create Sumitomo Heavy Industries, Ltd. The company continues to innovate and expand to meet the demands of the new market frontiers.[4] Today, Sumitomo Heavy Industries manufactures injection molding machines, laser systems, semiconductor machinery and liquid crystal production machinery.

In 1979, the company famously built the Seawise Giant, an Ultra Large Crude Carrier (ULCC) supertanker; the longest ship ever built.

As of 2021, it's reported that SHI has ceased making light machine guns for the JSDF due to bleak economic prospects.[5][6]


In 2013, SHI was reported to have falsified test data related to the manufacture of its machine guns.[7] SHI was fined 62,474,916 Yen and was given a five-month suspension.[8]


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  1. ^ "Corporate Profile". Retrieved August 6, 2014.
  2. ^ "Sumitomo Heavy Industries Financial Statements". Bloomberg Businessweek. Archived from the original on August 8, 2014. Retrieved August 6, 2014.
  3. ^ "Sumitomo Heavy Industries, Ltd". Nikkei Asia. Retrieved 2023-08-07.
  4. ^ "Sumitomo Heavy Industries in Russia". Retrieved 2014-03-01.
  5. ^ "Despite defense buildup, Japan's arms industry struggles | the Asahi Shimbun: Breaking News, Japan News and Analysis".
  6. ^ "Stop Japanese businesses' exodus from defense industry". 3 October 2022.
  7. ^ "FIRST LOOK: Japan's New Type 20 Assault Rifle – Small Arms Defense Journal".
  8. ^ "スクープ!住友重機械が機関銃生産から撤退へ". 15 April 2021.
  9. ^ "Mechatronics".