VEHICLE AIR-CONDITIONING DEVICE

A vehicle air-conditioning device includes a refrigerant circuit having a compressor, an indoor heat exchange unit, and an external heat exchange unit, an air-conditioning unit in which the indoor heat exchange unit is disposed, and a control device that controls the refrigerant circuit and the air-conditioning unit. The refrigerant circuit has a hot gas bypass, and the control device is capable of executing a hot gas heating operation. The control device performs, at the start of the hot gas heating operation, a preparatory operation of circulating refrigerant in the refrigerant circuit without heat dissipation in the indoor heat exchange unit or with the heat dissipation suppressed until the refrigerant is brought into a predetermined state, and limits air quantity adjustment on the quantity of air blown into the cabin at least during the preparatory operation.