VEHICULAR AIR CONDITIONING DEVICE, AND CONSTITUENT UNIT THEREOF

Provided is a vehicular air conditioning device which is based on a configuration adopted in a conventional vehicle including a hot-water heater, a heat-pump cooling device, and a control system, and which is capable of increasing heating performance at low cost and with a small increase in installation space. This vehicular air conditioning device is provided with: a first water refrigerant heat exchanger that vaporizes a refrigerant; a second water refrigerant heat exchanger that condenses the refrigerant; and a switching means capable of switching between a state in which the refrigerant flows in a refrigerant circuit including the second water refrigerant heat exchanger, a compressor, and the first water refrigerant heat exchanger, and a state in which the refrigerant flows in another refrigerant circuit including an evaporator, the compressor, and a condenser.