AIR CONDITIONER FOR VEHICLE

PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle that performs control capable of preventing a window, in particular, a windshield from fogging up, without wasted electricity consumption, when dehumidifying upon heating.SOLUTION: The air conditioner includes: a temperature sensor 5 which is an internal air temperature detector for detecting an air temperature of the inside of the vehicle; and a temperature sensor 6 which is an air temperature detector for detecting the air temperature of the outside of the vehicle. A dew point temperature of the inside of the vehicle is calculated with temperatures detected by the respective temperature sensors and setting humidity or humidity detected by a humidity sensor. The air conditioner compares the dew point temperature with the air temperature to determine whether the window, in particular, the windshield has fogged up. As a result, only when the window, in particular, the windshield is likely to fog up due to high humidity of outside air upon heating, the outside air is dehumidified by a first in-vehicle heat exchanger 10, and is afterward heated by a second in-vehicle heat exchanger 11.