AIR CONDITIONER FOR VEHICLE

A vehicle air conditioner includes: a compressor that compresses a refrigerant; a heat exchanger that performs heat exchange between the refrigerant and a heat transporting coolant; a condenser that condenses the refrigerant having a high-temperature and a high-pressure by dissipating heat thereof; an evaporator that performs heat exchange between air sent to a vehicle interior and the refrigerant having a low-temperature and a low-pressure; a refrigerant passage that flows the refrigerant therein; and an on-off valve capable of shutting off the refrigerant passage. A part of the refrigerant passage from the condenser to the compressor in the air-cooling refrigerant circuit is branched into a first passage passing through the evaporator and a second passage passing through the heat exchanger being in parallel to the evaporator. The on-off valve is disposed upstream of the heat exchanger in the second passage.