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Our company was founded at Kosai city, Shizuoka prefecture : the birthplace of Sakichi Toyoda (the founder of TOYOTA group) in 1950.

We initially named Washizu Seisakusho Co.,Ltd., we started our operation by manufacturing automotive parts for Nippondenso Co.,Ltd. (current DENSO CORPORATION).

Then we were renamed to HAMANAKODENSO CO.,LTD. in 1967. Ever since then, we have made steady progress as a member of DENSO group companies.

Here is one of Sakichi's last teachings: "Open your mind, and look at the great world outside". This instruction has cultivated our corporate philosophy of respecting challenges in the new world.

Following his spirit, we aim to become a company that contributes to improving the lives of people all over the world.


July 1950 Washizu Seisakusho Co., Ltd. was established.
Washizu Seisakusho Co., Ltd. began producing automotive parts for Nippondenso Co., Ltd.
(current DENSO CORPORATION) [capital: 300,000 yen]
November 1967 Washizu Seisakusho Co., Ltd. was renamed to HAMANAKODENSO CO., LTD.
November 1971 HAMANAKODENSO was designated a QC model plant by Nippondenso Co., Ltd.
April 1974 The surface treatment plant (coating and plating systems) was completed.
November 1979 Awarded the DEMING PRIZE.
December 1979 HAMANAKODENSO Cooperative Association was set up.
April 1981 The Associates’ Welfare Hall was completed.
October 1982 Awarded the Excellence Prize in Industrial Health Management by the Shizuoka Labor Bureau.
March 1983 The Machinery & Tool Manufacturing plant was completed.
Horn production business transferred from Nippondenso Co., Ltd.
July 1986 Increased capital to 478.88 million yen.
April 1989 The Kibi plant was completed.
July Awarded the Progress Prize in Industrial Safety by the Shizuoka Labor Bureau.
October 1990 Awarded the Effort Prize in Industrial Health Management by Minister of Labor.
February 1992 Awarded an excellent company prize on the 20th anniversary of the municipalization of Kosai City.
April 1st issue of corporative newsletter "HAMADEN Life.”
July 1993 The Toyohashi Office became the affiliated company "HAMADEN P‧S CO., LTD."
October 1994 Kibi Football Ground was opened.
February 1998 Received QS9000 certification.
August 1999 Kibi plant's 2nd-phase expansion was completed.
January 2000 Received ISO14001 certification.
April “HAMAJUKAI” (a group of retired associates) was established.
The Training Center was opened.
May 2001 Donated relief funds to the Kosai Health and Welfare Center
(in commemoration of the 50th anniversary of its foundation).
April 2002 “HAMANKODENSO KOSHOKAI” (a group of suppliers with close relationships) was set up.
May Zero emissions were achieved.
September The Kibi plant achieved “7 million hours zero accidents.”
March 2003 PT.HAMADEN INDONESIA MANUFACTURING (HDI) received ISO14001 certification.
June HAMADEN・P・S CO., LTD. received Eco Stage certification.
July Received an appreciation letter from the Minister of Health, Labor and Welfare for promoting blood donations.
May 2004 Received ISO/TS16949:2002 certification.
May 2007 The Technical and Training Center was completed.
August Kibi plant’s 3rd-phase expansion was completed.
October 2008 HAMADEN VIETNAM CO., LTD. was established.
December UN / ECE (United Nations Economic Commission for Europe) was acquired for horns.
October 2009 Awarded the Director’s Award by the Shizuoka Prefecture Association for Employment Support for the Disabled.
Awarded as the excellent safe driving office by the Kanto Safe Driving Managers’ Association, Kanto Police Bureau
November Awarded the Governor's Prize as an Excellent Technical Skill Certification Company.
October 2011 Recognized as an excellent company in safe driving by the Kanto Safe Driving Administrators’ Council
and the Kanto Regional Police Bureau.
April 2012 Certified as a Kosai district safe driving management promotion company for 2012.
November Awarded the Minister of Health, Labor and Welfare Prize for vocational ability development.
November 2013 Awarded the Volvo Quality Excellence Prize (VQE)
March 2014 Kibi plant was awarded as "Excellent Energy Saving Company 2013" by METI-kanto (Kanto Bureau of Economy, Trade and Industry)
April HAMADEN MEXICO S.A. DE C.V. (HDMX) was established.
June 2015 New canteen (named“ Blue Terrace”) was completed.
January 2016 Awarded as an excellent company by Japan Traffic Safety Association.