Diamond Electric Holdings Co., Ltd. engages in automobile, energy solution, and electronic control equipment businesses in Japan. The company manufactures and sells ignition coils, including pencil and square coil on plugs for automobiles. It also provides electrical equipment, such as DC-DC converter for power regeneration, hybrid vehicles, idling stops; controller for car air conditioners; body control unit; on-board chargers; rotation sensors, harness assembly; and switches for transmission. In addition, the company offers energy solutions, including solar inverters and hybrid systems with battery units, and TABUCHI-cloud, a remote monitoring service; power device products, such as reactors, normal and common mode choke coils, air core inductors, power and high voltage transformers, coils for IH cookers, and transformers for switching power supplies; and electronic control devices, including high voltage generators, controllers, and inverters. Diamond Electric Holdings Co., Ltd. was incorporated in 2018 and is headquartered in Osaka, Japan.