VEHICULAR AIR CONDITIONER

A vehicular air conditioner is provided which is capable of heating a vehicle interior with heat of a battery and also preventing deterioration in heating performance due to a decrease in circulating refrigerant. The vehicular air conditioner includes a battery temperature adjustment device to circulate a heat medium to thereby adjust the temperature of a battery mounted on a vehicle. The battery temperature adjustment device has a refrigerant-heat medium heat exchanger to exchange heat between the refrigerant and the heat medium, and includes a check valve to return the refrigerant flowing out from the refrigerant-heat medium heat exchanger to a suction side of the compressor and to obstruct the flow of the refrigerant flowing out from the refrigerant-heat medium heat exchanger and directed toward an outdoor heat exchanger and a heat absorber