Corporate Information History

＜MIYAJI IRON WORKS began operations＞
Eijiro Miyaji opened sole proprietorship in Minami-Futaba-cho, Honjo-ku, Tokyo. Began manufacturing bolts, iron doors, and similar products, and accepting orders for steel framework assembly.

Nationally-operated Nagasaki Seitetsusho ironworks established.

Name changed to Ministry of Industry Nagasaki Shipyard.

Merged with Yubin Kisen Mitsubishi Kaisha (the year when Mitsubishi Heavy Industries, Ltd. was founded).

Ojima Works opened in Ojima-machi, Minami-Katsushika, Tokyo. Bridge construction began from following year.

Minami-Futaba-cho Office and Ojima Works completely destroyed in fire. Company reorganized as MIYAJI IRON WORKS limited partnership company following the Great Kanto Earthquake with \50,000 in capital stock.

Minami-Futaba-cho Office and Ojima Works rebuilt. Company received large volume of orders for railway bridge construction due to damage from the earthquake.

Ojima Works expanded.

Head Office building and plant constructed in Minami-Suna-machi, Joto-ku. Minami-Futaba-cho Office and Ojima Works closed.

Keijo Office opened.

Company reorganized as joint-stock corporation with \500,000 in capital stock.

Company name changed to Mitsubishi Heavy Industries, Ltd.

Designated as a Navy-managed plant, took part in establishment of Tokyo Shipbuilding Works, Ltd.

＜Matsumoto Works (Hata Works) opened＞
Works burned down in Tokyo Air Raid. Part of plant operations relocated to Hata Village in Nagano on request from the Imperial Japanese Navy Technical Department, establishing the Hata Works (Matsumoto Works) (operations shut down completely in December 2014).

Hata Works began operations, Tokyo labor union formed.

Registered with Minister of Construction following enactment of Construction Business Act.

Suna-machi No. 2 Works (temporary assembly) began operations.
Works toured by Prince Takamatsu.

Engineer Training Center opened.
Fiscal reporting periods changed (from May and November to March and September).

Head Office building completed (Suna-machi).
New Hata Works office constructed.

Marked 50th anniversary of company’s foundation.
Osaka Sales Office, Nagoya Sales Office, and Sapporo Sales Office opened.
Over-the-counter trading of company stock on the Tokyo securities market started.

Fukuoka Sales Office opened.

＜MIYAJI CONSTRUCTION & ENGINEERING spun off as independent company＞
The civil construction department of MIYAJI IRON WORKS split off and MIYAJI CONSTRUCTION & ENGINEERING CO., LTD. established in Chuo-ku, Tokyo.

Registered with Minister of Construction following enactment of Construction Business Act.

Head Office relocated to Bunkyo-ku, Tokyo.

Company split into West Japan Heavy-Industries, Ltd., Central Japan Heavy-Industries, Ltd., and East Japan Heavy-Industries, Ltd. with the dissolution of the zaibatsu conglomerates (the year when Mitsubishi Heavy Industries, Ltd. was established).

Names of three heavy industries companies changed to Mitsubishi Shipbuilding & Engineering Co., Ltd., Shin Mitsubishi Heavy-Industries, Ltd., and Mitsubishi Nippon Heavy-Industries, Ltd.

Hata Works renamed Matsumoto Works.
Listed on the 2nd Section of the Tokyo Stock Exchange.

Listed on the 1st Section of Tokyo Stock Exchange.
(Delisted in September 2003.)

＜Suna-machi No. 1, No. 2, and No. 3 Works completed＞
Suna-machi No. 1 and No. 2 Works completed.
Suna-machi No. 2 Works expanded and No. 3 Works completed.

Omiya Warehouse opened.
Capital increased (\750 million).

Capital increased (\1,000 million).

New general office and Matsumoto West Works completed and designated as Japanese National Railways “quality management method” plant.

Capital increased (\30 million).

Kurihashi Warehouse (now Kurihashi Equipment Center) opened.
Osaka Office (now Kansai Branch Office) opened.

Listed on the 2nd Section of the Tokyo Stock Exchange.
(Delisted in September 2003.)

Three heavy industries companies merged and company name changed to Mitsubishi Heavy Industries, Ltd.

Decided to introduce the use of computers (the Burroughs B-2500) from 1971.

New Technology Building (six-story building) completed.
Promoted Osaka Sales Office to Osaka Branch Office.
Acquired Matsumoto Shimohara Works.

Business collaboration with Nippon Kokan.
Acquired land for construction of Fukuyama Works/Began pier construction
Acquired land for construction of new works in Fukuyama-shi, Hiroshima and began construction of a pier.

Technical Training Center closed.
Okinawa Sales Office opened.

Ichikawa Works (temporary assembly and painting works) opened.

＜Dramatic personnel reduction through reorganization＞
Head Office and Tokyo Works reorganized (eliminated 468 employees (224 people in clerical and technical positions, 244 operators)).
No. 1 Works closed and entire No. 1 Works organization moved to Tokyo Works.

No. 3 Works closed, equipment added to Ichikawa Works, Fukuyama Works grounds returned to Hiroshima Prefecture.

Sendai Sales Office opened.

Guam Thermal Power Plant Construction Project launched.

Received special construction business license under the Construction Business Act.

Head Office sold.

Head Office relocated to Koto-ku, Tokyo.

Mitsubishi Heavy Industries Construction Co., Ltd. established as a wholly-owned subsidiary of Mitsubishi Heavy Industries, Ltd.

All shares acquired by Seibi Group (Highest share price: \2,950).

Chairman Sakurai and Senior Managing Director Saka appointed at Extraordinary General Meeting of Shareholders.

Capital increased (\3,000 million).

Head Office relocated to Chuo-ku, Tokyo.
＜Large seaside plant (Chiba Works) opened＞
Works relocated to Chiba Works (Ichihara-shi) as seaside bridge plant and operations started in full.
Tokyo Works (Suna-machi) closed.

Matsumoto Works given Grade S Steel Frame Production certification.
Rotated employees from Matsumoto to Tokyo (first phase: 40 members).

Rotated employees from Matsumoto (second phase: 24 members).

Marked 80th anniversary of company’s foundation.
Constructed large component plant.
Purchased company housing in Tatsumidai, Ichihara-shi, Chiba.

Shojukai established.
Rotated employees from Matsumoto (third phase: 15 members).

Head Office relocated to Toshima-ku, Tokyo.

＜Rokugo Bridge accident＞
Rokugo Bridge accident occurred.

Purchased shares of Seiwa Construction Co., Ltd. (renamed MK ENGINEERING CO., LTD. in January 1991, now a non-consolidated subsidiary).

Tateshina recreational facility, Tateshina Villa renovated.
The first round of warrant bonds issued.
Matsumoto Alpine Hall completed.

Established Himawari Co., Ltd. in Ichihara-shi, Chiba (renamed Miyaji Technical Industry Co., Ltd. in June 1993).

The second round of warrant bonds issued.
Acquired land for Asahimura Works in Nagano.

Large (component manufacturing) plant completed.

Miyaji Steeltech Co., Ltd. established, Himawari Co., Ltd. renamed Miyaji Technical Industry Co., Ltd.

President Toyama appointed Executive Director of the Japan Bridge Association
(June 1993 to June 1997).

The third round of warrant bonds issued.
Hiroshima Sales Office opened.

Miyaji Comprehensive Maintenance Co., Ltd. established in Chiyoda-ku, Tokyo, through joint funding by MIYAJI IRON WORKS CO., LTD. and MIYAJI CONSTRUCTION & ENGINEERING CO., LTD.

The fourth round of warrant bonds issued.

Marked 50th anniversary of Matsumoto Works.

Marked 50th anniversary of MIYAJI labor union.

Chiba Works obtained ISO 9001 quality management system certification.

MIC Co., Ltd. established in Ichihara-shi, Chiba (merged with and absorbed by Miyaji Technical Industry Co., Ltd. (now MG Corporation Inc.) in July 2015).

MIYAJI ENGINEERING CO., LTD. established in Ichihara-shi, Chiba
(renamed Miyaji Planning Co., Ltd. in March 2004. Liquidation completed in March 2006).

Maintenance departments integrated.

Kyushu Branch opened (now Fukuoka Sales Office).

Yokohama Office and Hiroshima Office obtained ISO 9001 quality management system certification.

＜Establishment of MIYAJI ENGINEERING GROUP＞
MIYAJI ENGINEERING GROUP, INC. established.

Became the first holding company in the industry, listed on the 1st Section of the Tokyo Stock Exchange.

In order to respond to the sudden reduction in public sector investment, MIYAJI IRON WORKS CO., LTD. and MIYAJI CONSTRUCTION & ENGINEERING CO., LTD. were merged.

Head Office relocated to newly purchased building in Odenma-cho, Chuo-ku, Tokyo.

Omiya Equipment Warehouse closed.

Miyaji Comprehensive Maintenance Co., Ltd. transferred to MIYAJI CONSTRUCTION & ENGINEERING CO., LTD.

MIYAJI IRON WORKS CO., LTD. Matsumoto Branch established.

Concluded technical partnership agreement with Komai Tekko Inc.

Japan Fair Trade Commission complained.
Complied with recommendations.
Obtained ISO quality management system certification for entire company.
Manila Branch opened.
Sold land in Asahimura (110,307.82 m2) for \1,050 million.

66 employees voluntarily resigned.

Sold investment securities (three stocks, sale amount: \1,285 million).

＜Sale of Head Office building＞
Sold Head Office building (Odenma-cho, Chuo-ku) (land: 645 m2, buildings: 5,732 m2, sale amount: \3,400 million).

Marked 100th anniversary of company’s foundation.

Wholly-owned subsidiary Kumagai Kensetu Kogyo Co., Ltd. dissolved.

Purchased additional shares of Miyaji Comprehensive Maintenance Co., Ltd., converting it into a wholly-owned subsidiary.

Carried out absorption-type merger with Miyaji Comprehensive Maintenance Co., Ltd.

Head Office relocated to Chuo-ku, Tokyo.

38 employees voluntarily resigned.
Purchased additional shares of MK ENGINEERING CO., LTD., converting it into a wholly-owned subsidiary.

Obtained ISO 9001 quality management system certification for entire company.

Continued doing business with the absorption-type split of Mitsubishi Heavy Industries, Ltd.’s bridge and coastal structure business. Name changed to Mitsubishi Heavy Industries Bridge Engineering Co., Ltd.
Renewed ISO 9001 quality management system certification as Mitsubishi Heavy Industries Bridge Engineering Co., Ltd.

Name changed to Mitsubishi Heavy Industries Bridge & Steel Structures Engineering Co., Ltd.

Chiba Works constructed in Futtsu-shi, Chiba, and began temporary operation.

Bridge and coastal structure business transferred to Mitsubishi Heavy Industries Bridge Engineering Co., Ltd. through absorption-type split.

Acquired shares of Miyaji Technical Industry Co., Ltd. (now non-consolidated subsidiary MG Corporation Inc.) and converted it into a wholly-owned subsidiary.

＜MM BRIDGE brought into the Group＞
Acquired 51% of shares of Mitsubishi Heavy Industries Bridge & Steel Structures Engineering Co., Ltd. (now MMB), turning it into a subsidiary.

Outside Director system introduced.

Conducted share consolidation (10 to 1 consolidation).

＜Matsumoto Works closed＞
Closed Matsumoto Works, a steel frame production site, due to decline in construction demand resulting from the recession.

Dissolved wholly-owned subsidiary MIYAJI IRON WORKS CO., LTD. Matsumoto Branch and Alps Technical Industry Co., Ltd.

Transferred all shares of Miyaji Technical Industry Co., Ltd. to MIYAJI ENGINEERING GROUP, INC.

41 employees voluntarily resigned.

＜MIYAJI IRON WORKS and MIYAJI CONSTRUCTION & ENGINEERING merge. Name of merged company changed to MIYAJI ENGINEERING＞
Company merged with and was absorbed by MIYAJI CONSTRUCTION & ENGINEERING CO., LTD.

Solar power generation business launched in order to effectively utilize site of former Matsumoto Works, which was closed in 2010 when Matsumoto Power Plant began operations, and to engage in environmental business.

Constructed MIYAJI ENGINEERING Matsumoto Power Plant in Matsumoto-shi, Nagano, and began power generation business.

Carried out absorption-type merger with MIYAJI CONSTRUCTION CO., LTD.
Chiba Works renovation project (approx. \5 billion in capital investment planned for the four-year period of FY2018 to FY2021)

Chiba Works buildings and facilities partially damaged by Typhoon Faxai.

Established MK WORKS CO., LTD. in Kurihashi-machi, Kitakatsushika-gun, Saitama (now a non-consolidated subsidiary).
Nagoya Sales Office opened.

Absorption-type merger with MIYAJI IRON WORKS CO., LTD. Company name changed to MIYAJI ENGINEERING CO., LTD. (now a consolidated subsidiary).

Chiba Works buildings and facilities partially damaged by Typhoon Faxai.

Chiba Works began full-fledged operation.
Absorption-type merger with MBE Equipment Co., Ltd. Tokyo Head Office established in Mitsubishi Juko Yokohama Building in Yokohama-shi (Dual head office structure with a Hiroshima Head Office and a Tokyo Head Office).

Hiroshima Plant closed.
Tokyo Head Office relocated
(from Mitsubishi Juko Yokohama Building to Mitsubishi Heavy Industries, Ltd.’s Yokohama Dockyard & Machinery Works Kanazawa Plant/Main Technical Building).

Name changed to MM BRIDGE CO., LTD.

Hiroshima Head Office relocated (from Mitsubishi Heavy Industries, Ltd. Hiroshima Machinery Works Eba Plant to Ryoko Center Building).
East Japan Branch relocated (from Mitsubishi Heavy Industries, Ltd. Yokohama Dockyard & Machinery Works Kanazawa Plant to Nihonbashi, Tokyo).
Renewed ISO 9001 quality management system certification as MM BRIDGE CO., LTD.
Chiba Works closed.

Ichihara Works opened.

Toyama Branch opened.

Nagasaki Branch opened.

51% of shares of Mitsubishi Heavy Industries Bridge & Steel Structures Engineering Co., Ltd. transferred to MIYAJI ENGINEERING GROUP, INC.

Company format changed to a Company with an Audit and Supervisory Committee.

Transferred from Tokyo Stock Exchange 1st Section to Prime Market.

Chiba Works renovation project
Due to the COVID-19 pandemic, investment directly linked to productivity improvements, cost reductions, business efficiency improvements, etc. were continued while other new investments in the project plan were postponed.

Kansai Branch Office renamed the West Japan Branch.
Hiroshima Equipment Center (Mihara) opened.

Nasu Equipment Center transferred from Mitsubishi Heavy Industries Machinery Systems, Ltd.