A vehicle air conditioner (1A, 1B) that cools and heats a vehicle interior, the vehicle air conditioner comprising: a duct having an internal air inlet port and an external air inlet port at one end portion thereof, and a blowing port at another end portion thereof; a partition member provided so that a first flow path and a second flow path are formed in the duct; a first air blower disposed in the first flow path; a second air blower disposed in the second flow path; a first intake damper that adjusts a ratio between an amount of internal air flowing into the first flow path through the internal air inlet port and an amount of external air flowing into the first flow path through the external air inlet port; a second intake damper that adjusts a ratio between an amount of internal air flowing into the second flow path through the internal air inlet port and an amount of external air flowing into the second flow path through the external air inlet port; and a heat pump circuit (2A, 2B) comprising a first indoor heat exchanger that is disposed in the duct so as to be located in the first flow path or to face an outlet of the first flow path and that contributes mainly to heating, a second indoor heat exchanger that is disposed in the duct so as to be located in the second flow path and that contributes mainly to cooling, and an outdoor heat exchanger disposed outside the vehicle interior, wherein the duct is provided with a heating exhaust port for discharging air cooled in the second indoor heat exchanger to the outside of the vehicle interior in heating operation, and in the heating operation, (i) the first intake damper is controlled so that a mixed air of the internal air having flowed through the internal air inlet port and the external air having flowed through the external air inlet port is supplied into the first flow path, and the mixed air supplied into the first flow path is heated in the first indoor heat exchanger and is then blown into the vehicle interior through the blowing port, whereas (ii) the second intake damper is controlled so that only the internal air having flowed through the internal air inlet port is supplied into the second flow path, and the internal air supplied into the second flow path is cooled in the second indoor heat exchanger and is then discharged to the outside of the vehicle interior through the heating exhaust port. a duct having an internal air inlet port and an external air inlet port at one end portion thereof, and a blowing port at another end portion thereof; a partition member provided so that a first flow path and a second flow path are formed in the duct; a first air blower disposed in the first flow path; a second air blower disposed in the second flow path; a first intake damper that adjusts a ratio between an amount of internal air flowing into the first flow path through the internal air inlet port and an amount of external air flowing into the first flow path through the external air inlet port; a second intake damper that adjusts a ratio between an amount of internal air flowing into the second flow path through the internal air inlet port and an amount of external air flowing into the second flow path through the external air inlet port; and a heat pump circuit (2A, 2B) comprising a first indoor heat exchanger that is disposed in the duct so as to be located in the first flow path or to face an outlet of the first flow path and that contributes mainly to heating, a second indoor heat exchanger that is disposed in the duct so as to be located in the second flow path and that contributes mainly to cooling, and an outdoor heat exchanger disposed outside the vehicle interior, wherein a first indoor heat exchanger that is disposed in the duct so as to be located in the first flow path or to face an outlet of the first flow path and that contributes mainly to heating, a second indoor heat exchanger that is disposed in the duct so as to be located in the second flow path and that contributes mainly to cooling, and an outdoor heat exchanger disposed outside the vehicle interior, wherein the duct is provided with a heating exhaust port for discharging air cooled in the second indoor heat exchanger to the outside of the vehicle interior in heating operation, and in the heating operation, (i) the first intake damper is controlled so that a mixed air of the internal air having flowed through the internal air inlet port and the external air having flowed through the external air inlet port is supplied into the first flow path, and the mixed air supplied into the first flow path is heated in the first indoor heat exchanger and is then blown into the vehicle interior through the blowing port, whereas (ii) the second intake damper is controlled so that only the internal air having flowed through the internal air inlet port is supplied into the second flow path, and the internal air supplied into the second flow path is cooled in the second indoor heat exchanger and is then discharged to the outside of the vehicle interior through the heating exhaust port.