| 1852 |
In 1853 (Kaei 6), faced with the need to counter Western powers following Perry's arrival, the shogunate instructed the Mito Domain to establish a shipyard, leading to the founding of Ishikawajima Shipyard. |
| 1853-12-04 |
The founding of the shipyard in Edo and Ishikawajima by Tokugawa Siaw, Lord of Mito Domain. |
| 1875 |
Establishment of Ishikawajima Hirano Shipyard. Tomiji Hirano borrowed the site of the Ishikawajima Naval Arsenal from the Navy Ministry and established Ishikawajima Hirano Shipyard. |
| 1875 |
Tomioka Hirano borrowed the site of Ishikawajima Repair Yard from the Navy Ministry and established Ishikawajima Hirano Shipyard. |
| 1889 |
In 1889 (Meiji 22), a limited liability Ishikawajima Shipyard was established. |
| 1889-01-17 |
The day Ishikawajima Shipbuilding & Engineering Co., Ltd. was established. |
| 1893 |
In 1893 (Meiji 26), the company was renamed Tokyo Ishikawajima Shipyard, with Eiichi Shibusawa becoming chairman. |
| 1893 |
Eichi Shibusawa became the chairman. |
| 1907 |
In 1907 (Meiji 40), Harima Shipyard Co., Ltd. was established. |
| 1924 |
In 1924 (Taisho 13), Ishikawajima Aircraft Manufacturing Co., Ltd. was established. |
| 1924 |
Later became Tatekawa Aircraft Co., Ltd. |
| 1929 |
In 1929 (Showa 4), the automobile division was spun off, and Ishikawajima Automobile Manufacturing Co., Ltd. was established, later merging with Isuzu Motors. Harima Shipyard Co., Ltd. was renamed Harima Shipbuilding & Engineering Co., Ltd. |
| 1929 |
Later, after some mergers, became Isuzu Motors Limited, and Harima Shipyard Co., Ltd. was renamed Harima Shipbuilding Co., Ltd. |
| 1936 |
In 1936 (Showa 11), jointly with Shibaura Manufacturing (now Toshiba Corporation), Ishikawajima Shibaura Turbine Co., Ltd. was established, beginning the production of land-based steam turbines. |
| 1936 |
Manufacture of land-based steam turbines. |
| 1939 |
In 1939 (Showa 14), jointly with Shibaura Manufacturing and U.S. United Engineering, Shibaura Joint Industry Co., Ltd. was established. |
| 1941 |
In 1941 (Showa 16), Nagoya Shipbuilding Co., Ltd. was established (later merged). |
| 1945 |
In 1945 (Showa 20), the company was renamed Ishikawajima Heavy Industries Co., Ltd. |
| 1954 |
In 1954 (Showa 29), Kure Shipyard and Harima Shipyard became independent, establishing Kure Shipbuilding Co., Ltd. |
| 1954 |
Kure Shipyard, separated from Harima Shipyard Co., Ltd., established Kure Shipyard Inc. |
| 1957 |
In 1957 (Showa 32), Tada Factory was opened as a jet engine specialized factory. |
| 1959 |
In 1959 (Showa 34), Japan's first overseas shipyard, Ishikawajima Brazil Shipyard, was established. |
| 1959 |
Japan's first overseas shipyard. Pioneered Japanese companies' overseas expansion. |
| 1960 |
In 1960 (Showa 35), Ishikawajima Heavy Industries Co., Ltd. was formed through the merger of Ishikawajima Heavy Industries and Harima Shipyard. |
| 1961 |
In 1961 (Showa 36), Ishikawajima Shibaura Seiki Co., Ltd. was established following the absorption of Ishikawajima Shibaura Turbine. |
| 1961 |
Nagoya Heavy Industries Co., Ltd. established (later merged) |
| 1962 |
Merged with Ishikawajima Shibaura Seiki Co., Ltd. and Shibaura Molding Co., Ltd. (capital of 15.4 billion yen) |
| 1964 |
In 1964, the Yokohama First Factory (Heavy Machinery Factory) and Yokohama Second Factory (Shipbuilding Factory) were newly established. |
| 1964 |
Established Yokohama First Factory (current Yokohama Factory) as a heavy machinery factory. |
| 1964 |
Merged with Nagoya Shipbuilding Co., Ltd. and Nagoya Heavy Industries Co., Ltd. (capital of 24 billion yen) |
| 1964 |
Established Yokohama Second Factory (current JMU Yokohama Factory) as a shipbuilding factory (first ship launched on October 22) |
| 1967 |
In 1967, merged with Shibaura Joint Industry Co., Ltd. |
| 1967 |
Merged with Shibaura Joint Industry Co., Ltd. (capital of 25.872 billion yen) |
| 1968 |
In 1968, merged with Kure Shipyard Co., Ltd. |
| 1968 |
Completed Phase 1 construction of Yokohama Third Factory (current Yokohama Factory) as a heavy container factory. |
| 1968 |
Merged with Kure Shipyard Inc. (capital of 28.872 billion yen) |
| 1973 |
In 1973, Chita Factory (Aichi Factory) was opened. |
| 1981 |
In 1981, established the Japan Aircraft Engine Association (jointly with Mitsubishi Heavy Industries and Kawasaki Heavy Industries). |
| 1983 |
In 1983, established International Aero Engines Corporation to develop engines for civil aircraft (V2500). |
| 1988 |
In 1988, separated the Diesel Engine Division and established Diesel United Inc. |
| 1988 |
Separated the diesel engine division and established Diesel United Inc. |
| 1994 |
In 1994, the Yokohama Engineering Center was completed. |
| 1995 |
In 1995, jointly established Marine United Inc. with Sumitomo Heavy Industries. |
| 1998 |
In 1998, Soma Factory (Jet Engine Parts Factory) was completed. |
| 2001 |
In 2001, spun off the paper machinery division and established IHI Foit Paper Technology in joint venture. |
| 2002 |
In 2002, the second building of Yokohama Engineering Center was completed. |
| 2002 |
In 2002, divided the Marine and Ocean Business and established IHI Marine United Inc. |
| 2002 |
Divided the ship and marine business and established I.H.I. Marine United Inc. |
| 2003 |
In 2003, inherited Niigata Iron Works' engine business and transportation system and snow removal business, establishing Niigata Engine Co., Ltd. and Niigata Transys Co., Ltd. |
| 2003 |
Inheriting Niigata Iron Works' 'Engine Business' and 'Transportation Systems, Vehicles, Snow Removal-Related Business,' established Niigata Engine Co., Ltd. and Niigata Transys Co., Ltd. |
| 2003 |
Integrated space development business into I.H.I. Aerospace Inc. |
| 2004 |
In 2004, established Changchun Fawer Isikawa Turbocharger Co., Ltd., Hangzhou Xizi Isikawa Parking Equipment Co., Ltd., and IHI Shuli Compression Technology Co., Ltd. |
| 2004 |
Established Changchun Fuo Ishikawajima Turbocharger Co., Ltd. for vehicle turbochargers. |
| 2004 |
Established Hangzhou Xizi Ishikawajima Parking Equipment Co., Ltd. (Ishikawajima Transport Machinery Co., Ltd.) for mechanical parking systems. |
| 2004 |
Established IHI Shuli Compression Technology Co., Ltd. for general-purpose compressors. |
| 2006 |
In 2006, changed the head office location to Toyosu IHI Building, Koto-ku, Tokyo. |
| 2007 |
In 2007, established Soma Second Factory, renamed the original Soma Factory to Soma First Factory, and changed the company name to IHI Corporation. |
| 2007 |
Opened Soma Second Factory, renaming the existing Soma Factory to Soma First Factory, and established Soma Business Office. |
| 2007 |
Changed company name from Ishikawajima-Harima Heavy Industries Co., Ltd. to IHI Corporation. |
| 2008 |
In 2008, transferred the cement plant business to Kawasaki Plant Systems, Inc. |
| 2009 |
In 2009, abolished the Logistics and Steel Structures Business Headquarters and Machinery Business Headquarters, establishing five new sectors. |
| 2009 |
Abolished Logistics & Steel Structures Business Headquarters and Machinery Business Headquarters, and established five new sectors: Logistics Sector, Social Infrastructure Sector, Marine & Steel Structures Sector, Industrial Systems Sector, and Rotating Machinery Sector. |
| 2009 |
A new company, IHI Infrastructure System Co., Ltd., was established, inheriting the bridge, water gate, and other steel structures business from Kurimoto Iron Works Co., Ltd. and Matsuo Bridge Co., Ltd. |
| 2009 |
Japan Tunnel Systems Co., Ltd., a new company for shield tunneling machines, was established jointly with JFE Engineering Co., Ltd. |
| 2010 |
In 2010, abolished the Energy Business Headquarters and established the Energy Systems Sector and Nuclear Power Sector. |
| 2010 |
The Energy Business Headquarters was abolished, and the Energy System Sector and Nuclear Sector were newly established. |
| 2011 |
In 2011, established a joint venture company "IHI Toshiba Power Systems Corporation" with Toshiba Corporation for manufacturing turbine equipment for nuclear power plants. |
| 2011 |
A joint venture manufacturing turbines for nuclear power plants, IHI Toshiba Power System Co., Ltd., was established with Toshiba Corporation. |
| 2012 |
In 2012, made Myojo Electric Co., Ltd. a subsidiary, and fully acquired IHI Transport Machinery Co., Ltd. and Ishikawajima Kenzai Industry Co., Ltd. Established a joint venture with Paul Wurth in Luxembourg for steelmaking machinery. |
| 2012 |
Meisei Electric Co., Ltd., a telecommunications company, was made a subsidiary. |
| 2013 |
In 2013, integrated IHI Marine United Corporation and Universal Shipbuilding Corporation to establish Japan Marine United Corporation. Rights of IHI Metal Tech were succeeded to Mitsubishi Hitachi Metals Machinery. |
| 2013 |
Japan Marine United Corporation was established by integrating IHI Marine United Inc. and Universal Shipbuilding Corporation under JFE Holdings. |
| 2013 |
Rights and obligations related to the rolling mill business of IHI Metal Tech Co., Ltd. were succeeded to Mitsubishi Hitachi Metals Machinery, Inc. |
| 2013 |
Succession of rights and obligations related to IHI Metal Tech's rolling mill business to Mitsubishi Hitachi Metals Machinery Co., Ltd. |
| 2013 |
Succession of rights and obligations related to IHI Metal Tech's rolling mill business to Mitsubishi Hitachi Metals Machinery Co., Ltd. |
| 2013 |
The rights and obligations related to the rolling mill business of IHI Metaltech Corporation will be succeeded to Mitsubishi Hitachi Metals Machinery Corporation. |
| 2014 |
In 2014, acquired Steinmuller Engineering GmbH to enter the lignite-fired boiler market. |
| 2014 |
Steinmuller Engineering GmbH was acquired to facilitate early entry into the lignite-fired boiler market. |
| 2015 |
In 2015, acquired the German company VTN, a contract service provider for heat treatment, and made it a wholly owned subsidiary. |
| 2015 |
German VTN Beteiligungsgesellschaft GmbH (now IHI VTN GmbH), which provides comprehensive heat treatment contract services, was acquired and made a wholly owned subsidiary. |
| 2015 |
Acquisition and full subsidiary status of VTN Beteiligungsgesellschaft GmbH, a German company providing comprehensive heat treatment contract services (now IHI VTN GmbH). |
| 2016 |
In 2016, transferred JEI's EAS investment shares, established a joint company for woody biomass power generation, integrated tunnel shield tunneling machine business and started operations, and transferred shares of construction machinery business. |
| 2016 |
Nanatsujima Biomass Power LLC was established with eight investing companies to develop power generation using woody biomass. |
| 2016 |
JIM Technology Co., Ltd. began operations after integrating with Mitsubishi Heavy Industries Mechatronics Systems Co., Ltd. to strengthen competitiveness and profitability in tunnel shield tunneling machine business. |
| 2016 |
All shares of IHI Construction Machinery Co., Ltd. were transferred to Kato Seisakusho Co., Ltd. |
| 2016 |
Agreement to transfer all of JEI's investment shares in EAS to EAS's shareholders, Camargo Corrêa Group and Queiroz Galvão Group (transferred in April 2016) |
| 2016 |
Establishment of JIM Technology Inc. to strengthen competitiveness and profitability in tunnel shield tunneling machine business through integration with Mitsubishi Heavy Industries Mechatronics & Systems Co., Ltd. |
| 2016 |
Agreement to transfer all of JEI's investment shares in EAS to EAS's shareholders, Camargo Corrêa Group and Queiroz Galvão Group (transferred in April 2016). |
| 2016-04 |
Agreement was reached to transfer all of JEI's investment shares in EAS to the shareholders of EAS, Camargo Corrêa Group and Queiroz Galvão Group, in April 2016. |
| 2016-04 |
Agreement to transfer all shares of EAS held by JEI to the shareholders of EAS, Camargo Corrêa Group and Queiroz Galvão Group (transfer in April 2016). |
| 2017 |
In 2017, decided to close the Aichi factory and transfer the marine machinery business. |
| 2017 |
It was decided to end the production functions at Aichi Factory after completing the orders for F-LNG and marine structures. |
| 2017 |
The ship machinery business was transferred to Aioi Machinery Co., Ltd. |
| 2017 |
Decision to end production functions at Aichi Factory after completing orders for F-LNG and marine structures. |
| 2017 |
Transfer of marine machinery business to Arai Machinery Co., Ltd. |
| 2017 |
Regarding Aichi Factory, it has been decided to end its function as a production base after completing the orders for F-LNG and marine structures. |
| 2017 |
The marine machinery business was transferred to Aioi Machinery Corporation. |
| 2017 |
It has been decided to end the function of Aichi Factory as a production base after completing the orders for F-LNG and marine structures. |
| 2019 |
In 2019, integrated process plant business and IHI Plant Engineering to establish IHI Plant. Simultaneously, integrated land-based prime mover business and diesel united to establish IHI Prime Mover. |
| 2019 |
IHI's process plant business was integrated with IHI Plant Engineering Co., Ltd. and IHI Plant Construction Co., Ltd. to establish IHI Plant Co., Ltd. |
| 2019 |
IHI's land-based prime mover business was integrated with Diesel United Inc. and Niigata Prime Mover Co., Ltd. to establish IHI Prime Mover Co., Ltd. |
| 2021 |
In 2021, Tsurugashima Factory started operation as a private aircraft engine maintenance base. Fully acquired Myojo Electric. |
| 2021 |
Tsurugashima Factory started operations as a maintenance base for civilian aircraft engines. |
| 2021 |
Meisei Electric Co., Ltd. was made a wholly owned subsidiary through a simplified share exchange. |
| 2022 |
In 2022, transferred the pharmaceutical manufacturing plant business of IHI Plant to JGC and transferred shares of IHI Technical Training Institute. |
| 2022 |
The pharmaceutical manufacturing plant business of IHI Plant Co., Ltd. was transferred to JGC Corporation. |
| 2022 |
Transfer of all shares of IHI Technical Training Institute Co., Ltd. to PEO Construction Equipment Training Center Co., Ltd. |
| 2022 |
Transfer of IHI Plant's pharmaceutical manufacturing plant business to JGC Corporation. |
| 2023 |
In 2023, transferred IHI Prime Mover's large marine engine business to Mitsui E&S Holdings. |
| 2023 |
Transfer of IHI Marine Large Engine Business to Mitsui E&S Holdings Co., Ltd. |
| 2025 |
In 2025, transferred shares of IHI general-purpose boilers to Takuma, grass and turf management equipment of IHI Agritech to Kyowa Corporation, transport system business to TADANO, shares of building materials industry to Verteks Corporation, and Transys shares to J.K.F. |
| 2025 |
Transfer of IHI General Boiler shares to Takuma Co., Ltd. |
| 2025 |
Transfer of IHI Agriculture Tech's turf and lawn management equipment business to Kyoei Corporation. |
| 2025 |
Transfer of IHI Transport Machinery Co., Ltd.'s transport system business to Tadano Ltd. |
| 2025 |
Transfer of IHI Building Materials Industry shares to Verteks Corporation. |
| 2025 |
Transfer of Niigata Transys Co., Ltd. shares to J.K.F. Co., Ltd. |
| 2025 |
Transfer of IHI Agriculture Tech's turf and lawn management equipment business to Kyoei Corporation. |
| 2025 |
Transfer of IHI Transport Machinery Co., Ltd.'s transport system business to Tadano Ltd. |
| 2026 |
In 2026, transferred shares of Myojo Electric to Nomi Bosai and shares of Su Tekkō to Tokiwa Tekkō. |
| 2026 |
Transfer of Meisei Electric Co., Ltd. shares to Nomi Bosai Co., Ltd. |
| 2026 |
Transfer of Kotetsu Iron Works Co., Ltd. shares to Tokiwa Iron Works Co., Ltd. |
