To make a temperature of a seat suited at seating time, even in the cold season, by providing a warm heater in the seat, also a charge means performing carrying of a current to the warm heater when an on-car battery is charged.

In the inside of a seat, a warm heater 14 is laid, also a power supply line 15 for carrying a current in this warm heater 14 is connected to a charge control circuit 16 in a charger 10. That is, in order that a current can be carried at charge time in the warm heater 14, separately from a charge current supply circuit 16A to a battery 7 in the charge control circuit 16, a heater current carrying circuit 16B for supplying partly supply power from a commercial power supply to the warm heater is provided. In this way, a a current carrying time in the warm heater 14, unreasonably lengthened reversely shortened, can be avoided, even in the cold season, a temperature of the seat can be suited for seating.