To provide a vehicular air conditioner in which the uncomfortableness of an occupant by a warm wind at the use time of a defroster is eliminated by improving the performance of the defroster device.

An air suction port 20 communicated through a blower suction port 1a and an intake air flow passage 21 is arranged on the circumference of a window glass except the arrangement of a defroster blow out port 13. The intake air flow passage 21 is connected to the inner air suction side of the blower suction port 1a and a circulated inner air suction port 18 and the air suction port 20 can be selected by an intake air flow passage switch damper 23. At the use time of the defroster, a warm wind blowed out from the defroster blow out port 13 flows along the window glass and is sucked from the air suction port 20.