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 Company NameSeihatsu Spring Co., Ltd.
 Head Office
 & Main Factory
4-33-5 Nishirokugo Ota-ku, Tokyo 144-0056 Factory Info. GoogleMap
 Nagano Factory 411 Nakajohidaka, Nagano city, Nagano 381-3201 Factory Info. GoogleMap
 Nagano no.2  Factory 3494 Takafu, Ogawa-mura, Kamiminochi-gun, Nagano 381-3302 Factory Info. GoogleMap
 Shizuoka Factory 722 Nagasaki, Shimizu-ku, Shizuoka city, Shizuoka 424-0065 Factory Info. GoogleMap
 Seihatsu Kyusyu
 Co., Ltd.
4550-51 Omagari, Yoshinogari-cho, Kanzaki-gun, Saga 842-0103 Factory Info. GoogleMap
 Co., Ltd.
700/765 Moo.1, Amata Nakorn Industrial Estate (Phase 8)
T. Phanthong, A. Phanthong, Chonburi 20160 Thailand
Factory Info. GoogleMap
 FoundedFebruary 11, 1959
 Established December 1, 1960
 Capital10 million JPY
 RepresentativeTerufumi Ota, Representative Director and President
 Main BusinessMetal plasticity process; punching, bending, coiling, and assembly process of plates and wires for automobiles, telecommunications, OA machinery, consumer electronics, metal mold design and manufacturing.


1959Satoru Ota founds the Ota Hatujo Manufactory Company at Chuo, Ota-ku, Tokyo.
1960Seihatsu Spring Co., Ltd. established and Director Satoru Ota assigned Representative.
1967Head office and main factory relocated to present location.
1970Nagano Factory established at Hidaka, Nakajo-mura, Nagano city, Nagano.
1977Austempering Furnace introduced at main factory, integrated production system established for flat spring.
1980Capital increased to 10 million JPY.
1984TQC started to reformation.
1988Registered with Fuji Xerox Co., Ltd. as a quality certified factory.
1994Shizuoka Factory established at Shimizu-ku, Shizuoka city, Shizuoka.
1994Satoru Ota assigned as Representative Director and Chairman, and Terufumi Ota as Representative Director and President.
1995Registered with ICHIKOH INDUSTRIES, LTD. as a quality certified factory.
2000Obtained ISO9001 certification.
2000Registered as QA factory with Panasonic Corporation.
2003 Obtained ISO14001 certification.
2005Nagano no.2 Factory established at Kofu, Ogawa-mura, Kamiminochi-gun, Nagano.
2007 Affiliated company, Seihatsu Kyusyu Co., Ltd. established.
2007TS16949:2002 launched.
2008Seihatsu Kyusyu Co., Ltd. established its head office and factory at Yoshinogari-cho, Kanzaki-gun, Saga (Saga Tobu Chukaku Industial Park).
2010SEIHATSU (THAILAND) Co., Ltd. established.

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