| Company name | Yamaguchi Seiki Kogyo Co., Ltd. | 
| President | Yamaguchi Taichi | 
| Address | Fukutomi Nagata 1-1, Gifu-City, Gifu-Prefecture 501-2564, Japan | 
| Phone・FAX | Phone:+81-58-229-5558 / FAX:+81-58-229-5556 | 
| URL | https://www.y-s.co.jp/wp/ | 
| E-mail | yamaguchi-seiki@y-s.co.jp | 
| number of Employee | Regular 150 (Total 180) | 
| Foundation | 1968 | 
| Capital | 80,000,000 JPY ($1million) | 
| Business range | Mold design and manufacturing for automotive plastic parts(80 to 3500 tonnage) | 
| Land area | 18,078㎡ | 
| Plant area | 8,439㎡ | 
| Main customer 〈Interior,Exterior and General parts〉
 | 
Asahi Kasei Chemicals CorporationIkuyo Co., Ltd.Uchihama Kasei Co., Ltd.Kasai Kogyo Co., Ltd.Kawamura-Kako Co., Ltd.Kanto Kasei Co., Ltd.Kanto Manufacturing CorporationSankei Giken Kogyo Co., Ltd.Sanko Co., Ltd.Sanwa Industry Co., Ltd.SSIOTEC Co., Ltd.Shigeru Co., Ltd.CCB Co., Ltd.SNIC Co., Ltd.Daikyo Nishikawa CorporationTGAP Co., Ltd.TG-Techno Co., Ltd.TOKAI RIKA Co., Ltd.Toyoriko Co., Ltd.Toyota Boshoku CorporationToyota Boshoku Tohoku CorporationToyoda Gosei Co., Ltd.Toyoda Gosei UK Ltd.Trinity Industrial Corp.NANJO Auto Interior Co., Ltd.NISSEN CHEMITEC CORPORATIONBASF Japan Ltd.Japan Plastics Technologies Co., Ltd.Vuteq CorporationFuji Seat Co., Ltd.Howa Co., Ltd.Moriroku Technology Co., Ltd.Yazaki Kako Corporation | 
| Main customer 〈Bumpers・Instrument panels〉
 | 
Kawanishi Paint Co., Ltd.Kuroda Auto-Tech(Thailand) Co., Ltd.Sankei Giken Kogyo Co., Ltd.Suzuki Motor CorporationSubaru CorporationDaihatsu Motor Co., Ltd.Daihatsu Motor Kyushu Co., Ltd.Toyota Motor CorporationToyota Motor Europe NV/SAToyota Motor Engineering & Manufacturing North America, Inc.Toyota Motor Kyushu. Inc.Toyota Motor East Japan. Inc.Toyota Industries CorporationToyota Auto Body Co., Ltd.Toyoda Gosei Co., Ltd.Nissan Motor Co., Ltd.Hino Motors, Ltd.Honda Motor Co., Ltd.Mazda Motor CorporationMitsubishi Motors CorporationYachiyo Industry Co., Ltd. |