Company history

Aisin’s two roots both begin in the wartime aircraft industry. In 1943 Toyota Motor and Kawasaki Aircraft jointly set up Tokai Aircraft Co. to make aircraft parts in the last years of the Pacific War; its work on aero-engines lasted only until Japan’s defeat. The postwar ban on aircraft manufacture and the collapse of military demand stripped the firm of its business overnight, and through 1947–48 it converted to sewing machines and automobile parts, re-founding in June 1949 — under the corporate rehabilitation law — as Aichi Kogyo Co., Ltd. The origin of a Toyota-group parts maker thus lay not in a chosen enterprise but in the forced rebuilding of a defeated aircraft company.

Aichi Kogyo listed on the Nagoya Stock Exchange in 1952 and rebuilt on two legs — replacement auto parts and sewing machines — adding die-casting as a third pillar in 1953. In 1961 it began manufacturing automatic transmissions, the seed of what would become its defining business, and reached the first section of the Nagoya exchange that October.

Aisin’s other root was likewise born of the war. Shinkawa Kogyo, founded in 1945 inside Tokai Aircraft’s Kariya plant at the instigation of Toyota’s Kiichiro Toyoda, turned to civilian demand at the surrender and grew, as a direct Toyota-group supplier, into a maker of clutches and body parts. The two sibling companies — one strong in transmissions and brakes, the other in clutches and bodies — were being readied, though neither yet knew it, for a union.

In August 1965 Aichi Kogyo absorbed its sibling Shinkawa Kogyo and took the name Aisin Seiki — Ai from Aichi and Shin from Shinkawa, so that neither name was lost. Eiji Toyoda, then a Toyota Motor vice-president, had floated the idea in 1961; the Toyota group let it mature for four years before the deal was sealed at the end of 1964. Combining two roughly equal makers of drivetrain and body components into a single firm was meant to harden the group’s core parts supplier.

The transmission business at the company’s heart carried a problem: the Warner-type automatic transmission that Toyota’s cars used rested on Borg-Warner’s basic patent, and Aisin could not develop it freely. Rather than fight, Aisin Seiki and Toyota Motor negotiated with the patent holder itself, and in 1969 the two sides set up the fifty-fifty Aisin Warner (renamed Aisin AW in 1988) in Kariya. The venture brought the AT technology in-house and grew into a business that held top-tier global share in automatic transmissions for the next half-century.

In 1970 the enlarged group reached the first sections of the Tokyo and Osaka stock exchanges and opened its first American company — the beginnings of a supply network that would follow Toyota abroad.

Through the 1980s and 1990s Aisin built out North America in step with Toyota’s own move to make cars there. It separated manufacturing from sales in 1988, re-consolidated them into a single American holding structure by 2001, and localized casting and automatic-transmission production along the way — the textbook pattern of a Toyota-group supplier following its customer overseas.

At home the group organized itself function by function. Manual transmissions were spun into Aisin AI in 1991, precision parts into a dedicated company in 1992, and casting had long sat in Aisin Takaoka — a lattice of specialist affiliates arrayed around the parent, Aisin AW and the rest.

The most consequential move was to pool brakes. In 2001 Aisin joined Denso, Sumitomo Electric and Toyota to found Advics, and by 2010 it had transferred its Kariya brake plant into the venture. It was one piece of a wider rationalization in which the major Toyota-group suppliers — Denso, Aisin, Toyota Industries and the others — traded and concentrated whole product lines among themselves.

The recovery after the 2008 crash carried Aisin’s revenue to new highs through the 2010s, and the company moved to IFRS reporting. It also filled out its portfolio, taking full control of body-frame maker Shiroki Kogyo in 2016 and piston maker Art Metal in 2017, so that transmissions, body mechanisms, brakes, pistons and casting all sat within one group.

In April 2021 Aisin Seiki absorbed Aisin AW and renamed itself simply Aisin, folding the twin pillars built in 1965 and 1969 back into one. The logic was electric. An automatic transmission is a part an EV does not need, so the accelerating shift to electric vehicles cuts directly into what had long been the group’s earnings engine; unifying the company and the brand was a way to steer an AT-dependent structure toward electric drive — and to decide faster under one management.

Under Moritaka Yoshida, a career insider from Toyota Motor who became president in 2020, Aisin is investing in the next-generation ground — electric drive units (eAxle), electrified and self-driving components — while managing the measured wind-down of the AT business, and it absorbed Aisin Chemical in 2025. Eighty years after its 1949 re-founding as Aichi Kogyo, the company’s central question is whether it can re-bridge the assets of the transmission age to the electric one fast enough, carried on the steadiness of Toyota’s global sales.