NISSEI began producing sewing machine parts in 1942. The technology refined in the course of the business enabled the company to begin production of small fine pitch gears in 1955. NISSEI launched the production of die-cast parts in 1966, and developed a reducer in 1969 (a long-cherished product, developed on an in-house basis). The company has expanded its business by increasing the types of reducers and improving gear production capacity and technology.