Tamagawa Seiki Co., Ltd.

Tamagawa Seiki Co., Ltd. is a Japanese precision-engineering company specializing in motion-control components and sensors. Established on March 3, 1938, the company is headquartered in Iida City, Nagano Prefecture, with additional plants in Nagano and Aomori. It operates as a privately held corporate group with stated capital of ¥100 million and a consolidated workforce of roughly 2,680 employees. The company's product portfolio centers on devices that detect and control motion: rotary encoders, resolvers and synchros, servo motors and drivers, step motors and drivers, gyros and rate sensors, IMUs, LVDTs, and automatic control equipment. It also supplies aerospace and space products, and even bio research reagents. Its brand story emphasizes angular detection precision reaching one in 3,600,000 and products qualified for operating environments ranging from the ocean depths to Mars. Tamagawa Seiki sells both under its own brand and through contract manufacturing, and it maintains a global presence through exhibitions such as the International Robot Exhibition, Japan International Aerospace Exhibition, and Automechanika Frankfurt. Its components are used in robotics, aerospace, industrial automation, automotive, and marine applications. The company is led by Board Chairman & CEO Yasuo Hagimoto and President & COO Tadanori Matsuo, with Honorary Board Chairman Hiroyuki Hagimoto. As a long-established Japanese sensor and motor specialist, Tamagawa Seiki positions itself around the fusion of "motion and emotion" technologies — precise measurement and movement — and aims to build products that other companies do not or cannot.

Tamagawa Seiki Co., Ltd. was established on March 3, 1938, in Japan. The company built its business around precision electromechanical components, particularly devices for detecting and controlling motion. Over the decades it developed a broad portfolio spanning rotary encoders, resolvers and synchros, servo motors and drivers, step motors and drivers, gyros and rate sensors, IMUs, LVDTs, and automatic control equipment. The company is headquartered in Iida City, Nagano Prefecture, where its headquarters and first plant share the address at 1879 Oyasumi. It expanded within Nagano with a second plant in Iida and a third plant in Matsukawa-machi, and later established a significant manufacturing presence in Aomori Prefecture at the Hachinohe Plant, which includes multiple factories in Hachinohe, Nanbu-cho, and Misawa. Tamagawa Seiki has long served demanding industries. Its aerospace and space products have been used in environments ranging from the deep sea to Mars, and its brand story highlights angular detection precision of one in 3,600,000. The company also engages in contract manufacturing alongside its own branded products, and it maintains a trading affiliate, TAMAGAWA TRADING. In recent years the company has continued to release new products and update its lines. In December 2022 it renewed its VR type resolver (Singlsyn) into six lineups. In January 2023 it released the R/D Converter "VRDC." In August 2024 it highlighted that its i-FORJ product can provide optical transmission through rotating equipment such as surveillance camera platforms. In August 2025 it introduced new cost-effective "Standard" and "High-Precision" MEMS IMU models. The company also renewed its website in December 2025 and announced a relocation of its Tokyo office in August 2026. Tamagawa Seiki participates in major industry exhibitions, including the International Robot Exhibition, the Japan International Aerospace Exhibition, and Automechanika Frankfurt. It also sponsored the Tour of Japan (TOJ) Shinshu Iida Stage in June 2024. As of November 21, 2025, the company reported 665 employees at Tamagawa Seiki Co., Ltd. and 2,680 consolidated employees, with stated capital of ¥100 million. Leadership includes Honorary Board Chairman Hiroyuki Hagimoto, Board Chairman & CEO Yasuo Hagimoto, and President & COO Tadanori Matsuo.

• Tamagawa Seiki Co., Ltd. established

• VR type resolver (Singlsyn) renewed into six lineups

• Released R/D Converter "VRDC"

• Sponsored the Tour of Japan (TOJ) Shinshu Iida Stage

• i-FORJ optical transmission through rotating equipment highlighted

• Exhibited at Automechanika Frankfurt 2024

• Exhibited at Japan International Aerospace Exhibition 2024

• Introduced new cost-effective "Standard" and "High-Precision" MEMS IMU models

• Exhibited at 2025 International Robot Exhibition

• Website renewed

• Notice of relocation of the Tokyo Office

Precision motion-control specialist delivering sensors and motors with extreme accuracy for demanding environments from deep sea to space.

• Rotary Encoders

• Resolvers / Synchros

• Servo Motors / Drivers

• Step Motors / Drivers

• Gyros

• IMU

• Aerospace Products

• Space Products

• TUG-NAVI

• FG beads

• i-FORJ

• VRDC R/D Converter

• Singlsyn VR type resolver

1. 1TAMAGAWA SEIKI CO., LTD. official websitetamagawa-seiki.com
2. 2About Us | TAMAGAWA SEIKI CO., LTD.tamagawa-seiki.com
3. 3Company Profile | TAMAGAWA SEIKI CO., LTD.tamagawa-seiki.com
4. 4Brand Story | TAMAGAWA SEIKI CO., LTD.tamagawa-seiki.com