Yachiyo's main business is the one-stop business of the research and development of fuel tanks and roof sunroofs, as well as the assembly and production of finished vehicles with small exhaust volume. From the production of spare parts to the manufacture of finished vehicles, it reserves all-round high-tech technologies in automobile manufacturing. .

The parts business is mainly centered on the design, development and manufacturing of automotive functional parts fuel tanks and rooftops, and is also engaged in the production of parts such as metal plates and resins.

The finished car business began to be put into production of Honda's "step van" in 1972. The Four Days Factory was established in 1985, and Honda's small-displacement vehicles have produced more than 4.3 million units. The production of welfare vehicles and special vehicles began to be expanded in 2012. Rationally use the technology obtained from practical experience, and actively challenge the development of new businesses with the goal of becoming a "enterprise recognized and expected by society".

Yachiyo has 10 production bases in Japan and 16 overseas. With the internationalization of the business, the unique products produced by Yachiyo's unique excellent technology have been highly praised by domestic and foreign automobile companies such as Honda Group.