Company Info

Company Overview
Business Overview
Technology
Founder’s Vision

Company outline

ロゴ

With the unwavering support of our valued stakeholders, we are honored to mark approximately 80th year since our founding.

Expanding infinite possibilities
Empowering progress through the synergy of people and technology

The origin of our history and story lies in engine development.

Founder: Kiyoshi Tanaka

Founder: Kiyoshi Tanaka

  • March 1936 Graduated at the top of his class from the Department of Mechanical Engineering, Faculty of Engineering, Hokkaido Imperial University
  • April 1936 Joined Nakajima Aircraft Company Contributed to the design of various engines for the Zero Fighter and the long-range bomber “Fugaku”Served as the lead engineer for the Fugaku engine project
  • December 1945 Resigned from Nakajima Aircraft Company
  • November 1948 Founded Okuno Manufacturing Co., Ltd.
    (now Tokyo Plant Co., Ltd.)
  • February 9, 1989 Passed away.

Documents That Tell Our Story

Engine Romance

Engine Romance

A record of engine development that looks back on the path paved by predecessors and envisions future technological innovations.

Farewell to the Flying Battleship Fugaku

Farewell to the Flying Battleship
Fugaku

The Phantom Plan for a Massive Air Raid on the U.S. Mainland

Fugaku Blueprint

Fugaku
Blueprint

Archived in Our Company Collection

Since our founding in 1948, we have grown with the support of our valued stakeholders for nearly 80 years.

Looking toward our 100th anniversary, we will continue to embrace new challenges and pursue further growth.

PMVV

Supporting the Power Systems of the Future and Contributing to a Sustainable Society.

PURPOSE

We support the “power systems of the future.”

With energy diversity as a fundamental premise,
we contribute to the sustainability of power and propulsion technologies.

MISSION

We not only contribute to improving the performance of internal combustion engines and reducing emissions and fuel consumption,but also provide essential solutions for technological innovation in next‑generation powertrains that utilize hydrogen, electricity, ammonia, biofuels,

and other energy source.Through these efforts, we support the achievement of carbon neutrality. By delivering high‑precision test systems, we contribute directly to our customers’ manufacturing excellence.

VISION

While pursuing innovative manufacturing, we contribute to reducing greenhouse gas emissions through our technologies, products, and solutions. By mitigating environmental impact,

we help build a sustainable society and support long‑term economic development.

Through human‑capital‑focused management, we ensure the continuous well‑being of our staff.

VALUE

We strive to continuously grow as an organization that customers choose and trust, supported by robust systems and structures.We value both teamwork and individual strengths, fostering personal development while enhancing collective capability.We uphold a strong sense of professionalism.We promote a healthy work‑life balance.We embrace diversity and diverse values with an open mind.We build a psychologically safe environment where employees can take pride in their work and fully demonstrate their abilities.