A vehicle air conditioner driven with coolant and refrigerant, the vehicle air conditioner comprising: a first water-refrigerant heat exchanger which performs a heat exchange between a low-temperature and low-pressure refrigerant and a coolant for heat transportation, and vaporizes the refrigerant; a second water-refrigerant heat exchanger which performs a heat exchange between a high-temperature and high-pressure refrigerant and the coolant, and condenses the refrigerant; a heater core which heats an interior of a vehicle by using heat of the high-temperature and high-pressure refrigerant discharged by a compressor; a distributing unit which distributes the coolant, fed from a heat generating component of the vehicle, to a plurality of cooling paths; and a junction unit which joins the coolant guided from the plurality of cooling paths, and feeds the coolant to the heat generating component; an evaporator which performs a heat exchange between the low-temperature and low-pressure refrigerant and suction air fed to the interior of the vehicle; a condenser which releases heat from the high-temperature and high-pressure refrigerant to outside air and condenses the refrigerant; and a switch (13, 14), wherein the first water-refrigerant heat exchanger inputs the coolant distributed by the distributing unit, through a first cooling path of the plurality of cooling paths, feeds the coolant to be guided to the junction unit, to a second cooling path of the plurality of cooling paths, and feeds the refrigerant to the compressor, the second water-refrigerant heat exchanger inputs the coolant distributed by the distributing unit, through a third cooling path of the plurality of cooling paths, feeds the coolant to the heater core, and inputs the high-temperature and high-pressure refrigerant from the compressor, the heater core inputs the coolant fed by the second water-refrigerant heat exchanger, and feeds the coolant to be guided to the junction unit, to a fourth cooling path of the plurality of cooling paths, and characterized in that the switch (13, 14) can switch between a first state where the refrigerant flows along a first refrigerant circuit including the compressor, the second water-refrigerant heat exchanger, and the first water-refrigerant heat exchanger in this order, and a second state where the refrigerant flows along a second refrigerant circuit including the compressor, the second water-refrigerant heat exchanger, the condenser, and the evaporator in this order. a first water-refrigerant heat exchanger which performs a heat exchange between a low-temperature and low-pressure refrigerant and a coolant for heat transportation, and vaporizes the refrigerant; a second water-refrigerant heat exchanger which performs a heat exchange between a high-temperature and high-pressure refrigerant and the coolant, and condenses the refrigerant; a heater core which heats an interior of a vehicle by using heat of the high-temperature and high-pressure refrigerant discharged by a compressor; a distributing unit which distributes the coolant, fed from a heat generating component of the vehicle, to a plurality of cooling paths; and a junction unit which joins the coolant guided from the plurality of cooling paths, and feeds the coolant to the heat generating component; an evaporator which performs a heat exchange between the low-temperature and low-pressure refrigerant and suction air fed to the interior of the vehicle; a condenser which releases heat from the high-temperature and high-pressure refrigerant to outside air and condenses the refrigerant; and a switch (13, 14), wherein the first water-refrigerant heat exchanger inputs the coolant distributed by the distributing unit, through a first cooling path of the plurality of cooling paths, feeds the coolant to be guided to the junction unit, to a second cooling path of the plurality of cooling paths, and feeds the refrigerant to the compressor, the second water-refrigerant heat exchanger inputs the coolant distributed by the distributing unit, through a third cooling path of the plurality of cooling paths, feeds the coolant to the heater core, and inputs the high-temperature and high-pressure refrigerant from the compressor, the heater core inputs the coolant fed by the second water-refrigerant heat exchanger, and feeds the coolant to be guided to the junction unit, to a fourth cooling path of the plurality of cooling paths, and characterized in that the switch (13, 14) can switch between a first state where the refrigerant flows along a first refrigerant circuit including the compressor, the second water-refrigerant heat exchanger, and the first water-refrigerant heat exchanger in this order, and a second state where the refrigerant flows along a second refrigerant circuit including the compressor, the second water-refrigerant heat exchanger, the condenser, and the evaporator in this order.