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Founded Ba Group Iron Works by Ichiro Nozawa in Kotohira-cho, Shiba-ku, Tokyo, and established a factory in Tsukishima, Kyobashi-ku: Initiated domestic production of transmission and distribution towers and poles, overcoming technical challenges in research, development, design, and manufacturing, successfully commercializing the company.
Founded: October 6, 1917
Obtained patents related to transmission line towers.
Reorganized Ba Group Iron Works into a limited partnership.
Founder Ichiro Nozawa developed the three-dimensional structural architecture 'Diamond Truss', and subsequently delivered the first Diamond Truss building in Japan: Keio Railway depot in Nagaoka-cho, Tokyo, and Asahi Shimbun storage facility in Haneda.
Converted the limited partnership into Ba Group Iron Works Co., Ltd.
Established: June 26, 1934
Constructed Toyosu factory in Koto-ku, Tokyo.
Opened an office in Ginza, Tokyo (May 1954, headquarters).
Opened a branch office in Sapporo (April 1962, upgraded to Sapporo branch).
Received registration No. 874 under the Construction Business Act by the Minister of Construction.
Opened Osaka sales office (November 1959, upgraded to Osaka branch).
Opened Nagoya office (June 1978, upgraded to Nagoya branch).
Constructed Sapporo factory in Hokkaido.
Listed shares on the Second Section of the Tokyo Stock Exchange.
Constructed Oyama factory in Oyama, Tochigi Prefecture.
Opened Utsunomiya branch office (October 1973, upgraded to Utsunomiya branch).
Construction of Oyama Factory in Oyama City, Tochigi Prefecture
Utsunomiya Branch Office (promoted to Utsunomiya Branch in October Showa 48) opened
Opened Sendai sales office (June 1978, upgraded to Sendai branch, now Tohoku branch).
Opened Akita branch office (July 1975, upgraded to Akita sales office, April 2023 upgraded to West Tohoku Construction Branch).
Construction of Towada Factory in Towada City, Aomori Prefecture
Listed on Sapporo Securities Exchange
Opened Tokyo Sales Office (promoted to Tokyo Branch in October 1973)
Sendai Sales Office (promoted to Sendai Branch in June Showa 53, now Tohoku Branch) opened
Promoted to First Section of Tokyo Stock Exchange
Akita Branch Office (promoted to Akita Sales Office in July Showa 50, promoted to West Tohoku Construction Branch in April Reiwa 5) opened
Construction of Towada Factory in Towada City, Aomori Prefecture
Listed on the Sapporo Securities Exchange
Tokyo Sales Office (promoted to Tokyo Branch in October Showa 48) opened
Promoted to First Section of the Tokyo Stock Exchange
Received construction minister's permit (Special-49) No. 4607 under the Construction Business Act. (Renewed every 3 years)
Construction of Hiroshima Factory (now Sapporo Factory) in Hiroshima Town, Sapporo District, Hokkaido (now Kitahiroshima City)
Received construction minister's permit (Special-49) No. 4607 due to amendments to the Construction Business Act (renewed every 3 years thereafter)
Construction of Hiroshima Factory (now Sapporo Factory) in Hiroshima Town, Sapporo District, Hokkaido (now Kitahiroshima City)
Construction of Tomakomai Factory in Tomakomai City, Hokkaido
Construction of Tomakomai Factory in Tomakomai City, Hokkaido
Received construction minister's license (1) No. 3751 under the Building Lots and Buildings Transaction Business Act (renewed every 3 years thereafter)
Changed fiscal year from September 30 to March 31
Received construction minister's license (1) No. 3751 under the Building Transaction Business Act. (Renewed every 3 years)
Construction of Chiba Factory (now Chiba Business Office) in Sodegaura Town, Kimitsu District, Chiba Prefecture
Changed company name to Tomoe Corporation and English name to TOMOE CORPORATION
Received construction minister's permit (Special-7) No. 4607 under the Construction Business Act (renewed every 5 years)
Received construction minister's permit (Special-7) No. 4607 under the Construction Business Act (renewed every 5 years thereafter)
Received construction minister's license (4) No. 3751 under the Building Transaction Business Act (renewed every 5 years)
Obtained ISO9001 certification: excluding headquarters departments (General Affairs and Human Resources, Accounting and Finance, Real Estate, IFRS Preparation Office), Business Management Office, Internal Audit Office, Audit Committee Room
Received license (4) No. 3751 under the Building Lots and Buildings Transaction Business Act (renewed every 5 years thereafter)
Obtained ISO 9001 certification: Headquarters departments (General Affairs and Human Resources, Accounting and Finance, Real Estate, IFRS Preparation Office), Business Management Office, Internal Audit Office, Audit Committee Office excluding
Obtained ISO14001 certification
ISO 14001 certification obtained.
Consolidated Tokyo Koto-ku Toyosu Factory into Oyama Factory, Tochigi Prefecture
Relocated headquarters to Kachidoki, Chuo-ku, Tokyo
Established Kyushu Branch
Converted to license from the Minister of Land, Infrastructure, Transport and Tourism under the Building Transaction Business Act, and obtained license No. 87727 from the Governor of Tokyo. (Renewed every 5 years)
Relocated headquarters to Tsukishima, Chuo-ku, Tokyo
Celebrating its 100th anniversary
Celebrated our 100th anniversary.
Transition to the Tokyo Stock Exchange Standard Market
Relocation of headquarters to Kachidoki, Chuo-ku, Tokyo
Tomoe Corporation received the three-star (third-level) Eruboshi certification on July 31, 2025. It met the standards in all five categories: recruitment, employee retention, work style, the proportion of women in management, and diverse career paths. The company says it will continue working to create a comfortable workplace where people with diverse backgrounds can thrive.
Bara Corporation will close its Tokyo office on August 31, 2024. Future operations will be transferred to the Tokyo branch, and we will continue to strive to meet our customers' trust. We apologize for any inconvenience to stakeholders, and we ask for your continued patronage.
The company has completed the Akabane Residence in Kita Ward, Tokyo, with the aim of enhancing employee welfare facilities. The new dormitory is conveniently located a 2-minute walk from the station and is equipped with the latest facilities. This promotes the networking of young employees and the transmission of corporate culture, thereby improving corporate value.
Sakura Corporation has promoted the Akita Sales Office to a branch and renamed it to West Tohoku Construction Branch. The new branch was established on April 1, 2023, aiming to contribute to regional infrastructure development.
Tomoe Corporation announced that it will be featured on TV Tokyo’s “The Unknown Gulliver: Excellent Company Files.” The program is scheduled to include an interview with President and Representative Director Takashi Fukazawa, as well as the company’s technologies that support the construction of landmarks. It will air on Saturday, March 11, 2023, from 6:00 p.m. to 6:30 p.m.
Baka Corporation will close its Hiroshima branch on March 31, 2022. Subsequent operations will be transferred to the Osaka branch, and we will continue to strive to meet customers' trust.
Tomoe Corporation relocated to its new headquarters on February 13, 2017. The new address is 4 Tsukishima, Chuo Ward, Tokyo. We appreciate your continued support.
Kabura Corporation informs you that it will close its Oita factory, which has been supported for many years, and transfer some of its functions to the Koyama factory. The closure date is March 31, 2012, and after the closure, contact information including the address and phone number of the Koyama factory and headquarters is provided.
Bara Corporation closed its Aomori office on September 30, 2011. Some functions of the office were transferred to the Towada plant, and after the closure, the Towada plant and the Tohoku branch are provided as contact points.