Ichinen Holdings Co., Ltd. engages in automotive leasing, chemical, parking, machine tool sales, and synthetic resin businesses in Japan. It provides automobile leasing, fuel sales, and automotive maintenance and outsourcing services; and manufactures various chemical products to power, iron, and steel plants, as well as to repair shops and households. The company also operates parking lots and plots for facilities, such as supermarkets and hospitals, parking garages affiliated with tenant buildings, and idle lands; and offers automotive, industrial machine, air conditioning, and do-it-yourselfers tools.