A vehicle air conditioner (10A, 10B, 10C, 10D) for cooling and heating a cabin, comprising: a heat pump circuit including: a compressor for compressing a refrigerant; an outdoor heat exchanger for performing heat exchange between the refrigerant and air outside the cabin; an expansion mechanism for expanding the refrigerant; and a first indoor heat exchanger and a second indoor heat exchanger each for performing heat exchange between the refrigerant and air blown into the cabin by a fan; and a switching member, provided in the heat pump circuit, for switching a flow direction of the refrigerant in the heat pump circuit between a first direction and a second direction, the first direction being a direction in which the refrigerant discharged from the compressor passes through the outdoor heat exchanger, the expansion mechanism, the first indoor heat exchanger, and the second indoor heat exchanger in this order and returns to the compressor, and the second direction being a direction in which the refrigerant discharged from the compressor passes through the first indoor heat exchanger, the expansion mechanism, the outdoor heat exchanger, and the second indoor heat exchanger in this order and returns to the compressor; characterised in comprising a duct in which the first indoor heat exchanger and the second indoor heat exchanger are disposed, and through which air inside the cabin and/or air outside the cabin is allowed to flow by the fan; wherein the first indoor heat exchanger and the second indoor heat exchanger are arranged in a flow direction of the air in the duct, and the second indoor heat exchanger is located upstream of the first indoor heat exchanger. a heat pump circuit including: a compressor for compressing a refrigerant; an outdoor heat exchanger for performing heat exchange between the refrigerant and air outside the cabin; an expansion mechanism for expanding the refrigerant; and a first indoor heat exchanger and a second indoor heat exchanger each for performing heat exchange between the refrigerant and air blown into the cabin by a fan; and a switching member, provided in the heat pump circuit, for switching a flow direction of the refrigerant in the heat pump circuit between a first direction and a second direction, the first direction being a direction in which the refrigerant discharged from the compressor passes through the outdoor heat exchanger, the expansion mechanism, the first indoor heat exchanger, and the second indoor heat exchanger in this order and returns to the compressor, and the second direction being a direction in which the refrigerant discharged from the compressor passes through the first indoor heat exchanger, the expansion mechanism, the outdoor heat exchanger, and the second indoor heat exchanger in this order and returns to the compressor; characterised in comprising a duct in which the first indoor heat exchanger and the second indoor heat exchanger are disposed, and through which air inside the cabin and/or air outside the cabin is allowed to flow by the fan; wherein the first indoor heat exchanger and the second indoor heat exchanger are arranged in a flow direction of the air in the duct, and the second indoor heat exchanger is located upstream of the first indoor heat exchanger.