A vehicle air conditioner comprising: an air conditioner main body section including a housing that has an air flow passage provided inside; a first fan that feeds air guided from inside of a cabin and/or outside of the cabin to the air flow passage ; an evaporator that is provided in the air flow passage ; a heater core that is provided downstream of the evaporator ; and a temperature regulation door that is provided between the evaporator and the heater core and that regulates a ratio of air heading for the heater core to air bypassing the heater core ; and a duct unit for rear seats that is connected to a downstream side of the heater core in the housing and that guides conditioned air temperature-regulated by the air conditioner main body section to rear seats of the cabin , the duct unit for rear seats including a second fan that suctions and delivers the conditioned air and a duct for rear seats , the duct unit for rear seats having a second fan driving motor that directly drives a centrifugal fan accommodated in a fan case of the second fan by a rotary shaft , wherein the vehicle air conditioner comprises: an air guide port that opens to the housing to guide air for cooling a motor from downstream of the first fan and upstream of the temperature regulation door in the air flow passage ; a guide passage that guides the air for cooling the motor guided from the air guide port to the second fan driving motor ; and characterised by , a discharge passage that discharges the air for cooling the motor after passing through the second fan driving motor to the cabin . an air conditioner main body section including a housing that has an air flow passage provided inside; a first fan that feeds air guided from inside of a cabin and/or outside of the cabin to the air flow passage ; an evaporator that is provided in the air flow passage ; a heater core that is provided downstream of the evaporator ; and a temperature regulation door that is provided between the evaporator and the heater core and that regulates a ratio of air heading for the heater core to air bypassing the heater core ; and a duct unit for rear seats that is connected to a downstream side of the heater core in the housing and that guides conditioned air temperature-regulated by the air conditioner main body section to rear seats of the cabin , the duct unit for rear seats including a second fan that suctions and delivers the conditioned air and a duct for rear seats , the duct unit for rear seats having a second fan driving motor that directly drives a centrifugal fan accommodated in a fan case of the second fan by a rotary shaft , wherein the vehicle air conditioner comprises: an air guide port that opens to the housing to guide air for cooling a motor from downstream of the first fan and upstream of the temperature regulation door in the air flow passage ; a guide passage that guides the air for cooling the motor guided from the air guide port to the second fan driving motor ; and characterised by , a discharge passage that discharges the air for cooling the motor after passing through the second fan driving motor to the cabin . an air guide port that opens to the housing to guide air for cooling a motor from downstream of the first fan and upstream of the temperature regulation door in the air flow passage ; a guide passage that guides the air for cooling the motor guided from the air guide port to the second fan driving motor ; and characterised by , a discharge passage that discharges the air for cooling the motor after passing through the second fan driving motor to the cabin . <EOS>