The plant, which was built on an area of 3.11ha, will produce 480,000 engine castings a year.
The companys chairman Tatsumi Niwa said the company planned to increase capacity to 4.5 million products for domestic and export markets by 2019.
Earlier, Tokyo Keiki Inc. announced it had started construction of its $40-million plant, producing electro-magnetic and hydraulic equipment, at the 1,010-ha park.