Air conditioner for vehicle

An air-conditioner for a vehicle comprising:

• a heater core which heats air for air-conditioning by using cooling water of a cooling circuit which cools a fuel cell of a fuel-cell vehicle as a heat source;
• a heat exchanger arranged upstream of the heater core in a flow direction of the air for air-conditioning, the heat exchanger heating the air for air-conditioning by using refrigerant which flows through a heat pump cycle as a heat source;
• and
• a control part which controls operation of the heat pump cycle by executing a cooperative operation control using both the heater core and the heat exchanger in a manner that a target temperature of the air for air-conditioning heated by the heat exchanger is changed in accordance with a temperature of the cooling water, wherein
• when the temperature of the cooling water is higher than a heating possible temperature, the control part lowers the target temperature as the temperature of the cooling water becomes higher at least in a first predetermined temperature range,
• when the temperature of the cooling water is lower than the heating possible temperature, the control part raises the target temperature as the temperature of the cooling water becomes lower at least in a second predetermined temperature range, and
• when the target temperature becomes higher than the heating possible temperature, the control part controls the cooling water to be heated by the air for air-conditioning heated by the heat exchanger.