The present invention relates to an air conditioner for a vehicle, in which a means for fixing a cable connecting device is disposed integrally with an air-conditioning case, thereby having an optimized installation location, keeping rigidity, achieving weight lightening, and enhancing assemblability. The air conditioner is to condition air in the interior of the vehicle by heating or cooling indoor air, and includes: a cable connecting device for connecting an actuating means of a controller of the vehicle to actuate a door inside an air-conditioning case with an actuating means of the air-conditioning case by a cable; and a cable fixing part for fixing the cable connecting device to the air-conditioning case.