Sumitomo Riko Co., Ltd.
(Formerly, Tokai Rubber Industries)

Company Profile



3-1 Higashi Komaki-shi Aichi-ken, 485-8550, Japan

Business Overview

-Sumitomo Riko is under the umbrella of Sumitomo Electric Industries and manufactures rubber and plastic products such as anti-vibration rubber, hoses, noise insulation, and interior products. 

Initiatives for Improving Productivity in Japan
-The Company intends to swiftly improve productivity at its plants in and outside Japan. The company will adopt improvement examples experienced at its mother plants in Japan to its overseas plants. Sumitomo Riko successively purchased overseas competitor companies seven years ago. The improvement of productivity has not kept up with the expansion of the business size, and the company expects to suffer an operating profit decrease to 1.8%, half of its peak, for the fiscal year that ends in March 2020. The company aims to improve productivity within three years to secure a foundation for profitability. Sumitomo Riko has established a model line at its subsidiary, SumiRiko Yamagata Company Limited, as a mother plant for the improvement of labor-intensive production processes, by sending an improvement team. Sumitomo Riko has started to adopt the know-how and production line to its plants in Indonesia and Thailand. At Sumitomo Riko Komaki Plant, a mother plant for IoT (Internet of Things) and artificial intelligence (AI), the company will replace humans with AI for visual inspection, and will develop new preventive maintenance technology. (From an article in the Nikkan Jidosha Shimbun on March 12, 2020)


-Listed on the first section of Tokyo Stock Exchange and Nagoya Stock Exchange. (As of Mar. 31, 2020)
Name or Company Name Investment Ratio (%)
Sumitomo Electric Industries, Ltd. 49.64
Maruyasu Industries Co., Ltd. 10.50
Fukoku Bussan Co., Ltd. 2.62
Sumitomoriko Kyoei Stockholding 2.30
The Master Trust Bank of Japan, Ltd. (Trust account) 2.05
Employee stock holdings 1.74
State Street London Care of State Street Bank and Trust, Boston SSBTC A/C UK London Branch Clients - United Kingdom 1.50
Japan Trustee Services Bank, Ltd. (Trust Account) 1.40
Northern Trust Co. (AVFC) RE NV101 1.34
Japan Trustee Services Bank, Ltd. (Trust Account 9) 1.21
Total 74.30


Anti-vibration rubbers

-Heat-resistant Rubber

  • Engine mounts
  • Hydraulic engine mounts
  • Exhaust pipe supports

-Chassis parts

  • Suspension bushes
  • Suspension member mounts
  • Strut mounts
  • Active hydraulic suspension bushes

-Light-weight parts

  • Engine Mounts with Resin Brackets
  • Torque Rods with Resin Brackets
  • Urethane Bound Stoppers
  • Resin Dust Covers

-Active devices/systems

  • E-ACM : Electric Active Control Mount
  • VCS : Vibration Cancellation System


  • Dynamic dampers

Automotive hoses
-Rubber Fuel Hoses
-Resin Fuel Hoses
-Air Control Hoses
-Water Hoses
-Oil Hoses
-Air Conditioning Hoses
-Power Steering Hoses

Sound Controlling & Insulation Products
-Engine Covers
-Standing Wave Spacers

Heat Conducting & Sound Reducing Materials
-Magnetic Induction Foaming: MIF

Interior Equipment

Seal Products
-Connector Seals
-Wire Seals

Products for Fuel Cell Vehicles (FCV)
-Cell Gaskets


Dec. 1929 Established Syowa Kogyo (capitalization of 1 million yen) in Yokkaichi City to produce rubber belts.
Jan. 1930 Renamed as Kamata Choutai. Started producing flat conveyor belts.
Oct. 1937 After Sumitomo Densen Seizousho's (currently Sumitomo Electric Industries Ltd.) management participation, the Company was renamed as Tokai Gomu and started producing industrial rubber products aside from rubber belts.
Mar. 1941 Acquired Futaba Gomu in Ashiya City and renamed it Konan Works.
Apr. 1942 Acquired Watanabe Gomu Kogyosho in Okayama City and renamed it Okayama Works. Started manufacturing braided and coiled hoses.
Aug. 1943 Matsusaka Works merged and started.
Jul. 1945 Transferred Konan Works` production facilities to Okayama and Matsuzaka Works and closed Konan Works.
Jul. 1949 Listed on the Nagoya Stock Exchange.
Feb. 1954 Started production of anti-vibration rubber parts for automobiles.
Nov. 1960 Established Komaki Works.
Nov. 1961 Renamed as Tokai Rubber, Industries. Ltd.
Dec. 1964 Headquarters transferred to Komaki City.
Oct. 1966 Closed Yokkaichi Works to streamline production facilities and consolidated them in Komaki and Matsuzaka Works.
May 1968 Established Tokai Kasei Kogyo, a consolidated company, in Komaki City.
Jun. 1977 Okayama Works relocated to a new site in Okayama City.
Jun. 1981 Started producing liquid enclosed engine mounts.
Mar. 1984 Started producing rubber-made parts of OA appliances.
Jan. 1988 Established of DTR Industries, Inc. in Ohio, U.S.A.
Jun. 1990 Set up Fuji Susono Works.
Feb. 1994 Listed on the Second Section of the Tokyo Stock Exchange.
Jul. 1995 Established Tokai Eastern Rubber (Thailand) Ltd. (currently a consolidated subsidiary) in Thailand.
Dec, 1995 Established a consolidated subsidiary, Tokai Rubber (Tianjin) Co., Ltd., in China.
Aug. 1996 Established two consolidated subsidiaries, TRI USA Inc. and TTR Tennessee Inc. in the United States
Sep. 1996 Listed on the First Section of the Tokyo and Nagoya Stock Exchanges.
Feb. 1998 Established a consolidated subsidiary, TRI Ooita AE, in Bungo-takada City, Oita Prefecture.
Jul. 1999 Established a consolidated local subsidiary, TRI (Poland) Ltd., in Poland.
Apr. 2002 Established TRI Technical Center USA, Inc. in USA.
Oct. 2002 Established Tokai Rubber Industries (H.K.) Limited in Hong Kong.
Feb. 2003 Established Tokai Rubber Mold (Tianjin) Co., Ltd., a manufacturing company to produce molds for use in molding automobile rubber parts in China.
Mar. 2003 Established Tokai Dalian Hose Co., Ltd in China.
Sep. 2003 Established Tokai Rubber (Jiaxing) Co., Ltd. in China.
Oct. 2003 Disposed of its business rights in a conveyor-belt business to Bando Chemical Industries, Ltd.
Dec. 2003 Established Tokai Rubber (Guangzhou) Co., Ltd. in China.
Jan. 2004 Established Tokai Kasei (Tianjin) Auto Parts Co., Ltd in China.
Nov. 2005 Established Tokai Imperial Rubber India Pvt., Ltd. in India.
Dec. 2007 Established TRI Kyushu Ltd. and Tokai Kasei (Kyushu) Ltd.
May 2008 Established Tokai Rubber Auto-parts India Pvt., Ltd. in India.
Mar. 2010

Transferred production lines of its Okayama Plant to both its Komaki Plant and TRI Kyushu. After the transfer was completed, the Okayama Plant was closed down.

Mar. 2011 Established Huanyu Tokai Rubber (Tianjin) Co., Ltd. in China.
Jul. 2011 Established Tokai Rubber Technical Center (China) Co., Ltd. in China.
Aug. 2011 Established PT. Tokai Rubber Indonesia and PT. Tokai Rubber Auto Hose Indonesia in Indonesia.
Sep. 2011 Established Tokai Rubber Auto-parts India Private, Ltd. in India.
Feb. 2013 Acquired Dytech-Dynamic Fluid Technologies S.p.A., based in Italy.
Apr. 2013 Turned Inoac Tokai (Thailand) Co., Ltd. into a subsidiary.
May 2013 Acquired Anvis Group GmbH, based in Germany.
Jul. 2013 The Company acquired Produflex Minas Industria de Borrachas Ltda. (This Company is currently called Tokai do Brasil Industria de Borrachas Ltda.)
Oct. 2014 Changed its name from Tokai Rubber Industries Ltd. to Sumitomo Riko Company Limited.
Nov. 2014 Developed and launched production of a fuel-cell gasket designed for fuel-cell vehicles.
Apr. 2015 Established Sumiri FC Seal Co., Ltd.; in Komaki, Aichi Prefecture.
Apr. 2015 Established SumiRiko Yamagata Co., Ltd, located in Yonezawa City, Yamagata Pref., Japan.
Jan. 2016 Established global headquarters in Nakamura Ward, Nagoya, Japan.
Jan. 2016 Tokai do Brasil Industria de Borrachas Ltda. absorbed Tokai Rubber do Brasil Servicos Ltda. As a result, the new company adopted a new name, SumiRiko do Brasil Industria de Borrachas Ltda.
Jan. 2016 Established SumiRiko Automotive Hose Poland Sp. zo. o.
Dec. 2016 Established S-Riko Automotive Hose de Chihuahua S.A.P.I. de C.V. located in Mexico.
Jul. 2017 Established Sumitomo Riko (Asia Pacific) Ltd. located in Thailand.
Jul. 2018 Sumitomo Riko Hosetex Ltd. took over the operations of Sumitomo Riko Hose Sales Co.., Ltd., which both merged under the corporate name Sumitomo Riko Hosetex Ltd.
Apr. 2019 Merged Sumitomo Rick Fine Polymer, making it the Saitama Sales Office.
Jun. 2019 Established Suzhou Tokai Rubber Technology Co., Ltd. in China.

Supplemental Information 1