To solve the problem that it takes a long time for an air conditioner to get ready for conditioning the temperature of air blown out to a passenger compartment to a target temperature and that an occupant feels uncomfortable if an electric compressor is stopped for controlling electric power supply to an electrical load of the air conditioner.

When electric power supply to part of a plurality of electrical loads is restricted in a low charge condition of a battery 17, it is prioritized to stop electric power supply to electric heaters 53a, 53b which have quicker operational responses after start of electric power supply in the plurality of electrical loads and electric power supply to the electric compressor 17 of slow operation response is continued as long as possible. Consequently, when electric power supply to the electric heaters 53a, 53b is resumed after a charging condition of the battery 17 is improved, the electric heaters 53a, 53b of quick operational responses quickly show designated capacities to quickly condition the temperature of air-conditioned wind.