Company Profile

Facing limitless challenges in the precision instrument industry
Greetings Company Summary Equipment Locations Corporate History


Since our business foundation,Komatu Spring Industrial Co,Ltd.
grown steadily as Super precision spring manufacturer.
We were established in 1941 , when the company founder Kenichi Komatsu founded Komatsu Seisakusho at the present day location of the company head office (Ota-ku, Tokyo). Since then we have worked consistently hard in the design and manufacture of springs, displaying developmental ingenuity to become one of the world leaders in the field of precision springs and playing a leading role in the precision mechanical equipment industry.

Komatsu Spring Industrial Co., Ltd.
President and Representative Director Makiko Komatsu
In the beginning, we were primarily a factory specializing in the development of precision springs for camera shutters, however, in response to demand from other industries, we gradually expanded into becoming a specialized spring maker for the clock, electric appliance, communication device, OA device, vehicle part and other precision device industries, expanding our technical skills and especially taking pride in ourselves for being peerless in the high precision spring technology industry.
We strive for maximum customer satisfaction from both domestic users and users world-wide of our products, through careful attention to delivery deadlines, development of new products, efficient production, uniform quality, accuracy and cost effectivess made possible starting with our specialized molding machines based on our unique concepts and technology, facilities equipped with the latest Japanese, German, French and American designed coiling machines, forming machines and inspection devices and our expert staff.

We are confident that our corporate philosophy of "contributing to society through outstanding technical skill", endless effort, and devotion to providing service to international industry has led us to where we are today.

Company Summary

Super precision spring manufacturer.
Trade Name: Komatsu Spring Industrial Co., Ltd.
Founded: May 23, 1941
Company Incorporation: December 1, 1952
Capital: Paid-in Capital 100,000,000yen
Head Office: 5-3-18 Omori Minami, Ota-ku, Tokyo
Chairman and Representative Director: Setsuko Komatsu
President and Representative Director: Makiko Komatsu
Director: Hisaaki Komatsu
Director: Michinobu Tanaka
Corporate Auditor: Ken Shimamura
Employees: 90
Major Products: Precision springs for use in a range of fields: torsion springs, coil springs
(compression and tension), wire formings


Handling small to ten million unit orders.
661 Domestic manufactured spring automatic molding machines
21 Foreign manufactured spring automatic molding machines
7 Original design spring molding machines
51 Heat treatment furnaces and washers
13 Polishing machines for spring ends
168 Inspection equipment
46 Machine tools
16 Others


Headquarters / First Factory
5-3-18 Omori Minami, Ota-ku, Tokyo 143-0013
Tel: +81-3-3743-0231 (Main)
Fax: +81-3-3743-0235
Click here for a map (PDF)
Tokyo Second Factory
5-3-16 Omori Minami, Ota-ku, Tokyo 143-0013
Tel: +81-3-3743-0231 (Main)
Fax: +81-3-3743-0235
Tokyo Third Factory
5-3-18 Omori Minami, Ota-ku, Tokyo 143-0013
Tel: +81-3-3743-0231 (Main)
Fax: +81-3-3743-0235
Ogawara Factory
1-1 Aza Kinoinecho, Ogawaramachi, Shibata-gun, Miyagi 989-1214
Tel: +81-224-51-5100 (Main)
Fax: +81-224-51-5113
Akita Otamachi Factory
182-4 Aza Kitabiraki, Ota-cho Sainai, Daisen-shi, Akita 019-1611
Tel: +81-187-88-2101 (Main)
Fax: +81-187-88-2103
Tel: +62-26-435-1267
Fax: +62-26-435-1265

Corporate History

1941 Founded as a sole proprietorship by Kenichi Komatsu. Began with the design and manufacture of springs, flat springs and wire springs.
1943 Became a military designated factory. Factory relocated to the outskirts of Sendai city.
1951 Returned from factory evacuation and began with the production of wire springs.
1952 Incorporated as Komatsu Seisakusho Co., Ltd. as a result of increased production and sales and saw a remarkable rise in the ratio of production of precision springs for camera shutters.
1958 Began production of clock-related precision springs.
1960 Entered the automobile parts and electric appliance industries and began sales to related manufacturers.
1962 Converted to a joint-stock company (Capital: 4 million Yen) and changed trade name to Komatsu Spring Industrial Co., Ltd. Sales division was separated and established as "New Komatsu Spring Industrial Co., Ltd." as an independent sales company to expand sales channels.
1963 Second factory built in Tokyo to expand production capacity in response to increased demand.
1966 Acquired "New Komatsu Spring Industrial Co., Ltd." to streamline management.
1969 Commended by the Minister of International Trade and Industry for making notable contribution as an exporting company.
1973 Headquarter building rebuilt.
1975 Capital partnership with Tokyo Small and Medium Business Investment & Consultation Co., Ltd.
1976 Funaoka factory in Shibata-cho, Miyagi built.
1979 Convertible bonds converted to stock and added to capital, raising paid-in capital amount to 131,800,000 yen.
1981 Third factory built in Tokyo.
1984 Setsuko Komatsu appointed as Representative Director.
1986 Funaoka factory renovated.
1989 Akita Ota-cho factory built in Senpoku county (Daisen City), Akita prefecture.
1992 Akita Ota-cho second factory built.
1997 Opening of PT.KOMATSU BANE INDONESIA in Indonesia, beginning production overseas.
2002 Acquired ISO9001: 2000 authentication. NoJQA - QM7736.
2006 Registered with Ota Brand (Tokyo) Promotion Association No. 0039
Won prize at the "1st Competition of the Top 300 Small/Medium Sized Companies Producing Active Products" (Selected by the Small and Medium Enterprise Agency, METI).
2007 January: Acquired Eco-Action 21 authentication (Eco-Action 21: System based on guidelines related to the Management Environment System and the Environmental Reporting Guidelines set forth by the Ministry of the Environment).
April: Awarded honor of "Corporate Tax Return Excellence" from the Omori tax office.
July 11: Visitation by the Emperor (Headquarter factory).
September: Construction and relocation of new factory within the Ogawara factory due to aging of Funaoka factory.
2013 May Awarded honor of "Corporate Tax Return Excellence" from the Omori tax office.
2017 January Setsuko Komatsu(Chairman) has been published in "The 34th Excellent Management Awards Female Management Division Award" of Nikkan Kogyo Shimbun sponsored.
2017 April Setsuko Komatsu(chairman) was awarded Order Decorations, "The Order of the Rising Sun, Silver Rays" by the Emperor in the determination of the Government on April 29,2017.
scroll top
© Komatsu Spring Industrial Co., Ltd.