There is disclosed a vehicle air conditioner in which a refrigerant subcool degree of a radiator to satisfy both a high pressure and a refrigerant flow rate during heating can appropriately be controlled to achieve improvement of a heating capability. The vehicle air conditioner comprises a compressor 2 which compresses a refrigerant, a radiator 4 which lets the refrigerant radiate heat, an outdoor heat exchanger 7 disposed outside the vehicle interior to let the refrigerant radiate or absorb heat, and a controller. The controller executes a heating mode to let the refrigerant discharged from the compressor 2 radiate heat in the radiator 4, decompress the refrigerant by which heat has been radiated and then absorb heat in the outdoor heat exchanger 7. The controller 32 has a high pressure priority mode to increase a target radiator subcool degree TGSC of the radiator 4 in a direction in which the high pressure is set to a predetermined high value, and a revolution number priority mode to decrease the target radiator subcool degree of the radiator in a direction in which the revolution number of the compressor 2 is set to a predetermined high value.