The present invention relates to an air conditioner for a vehicle, which includes coupling portions formed on both sides of a scroll case, a connection cover coupled to one coupling portion and having an inlet ring and a dual ring, a motor housing coupled to the other coupling portion of the scroll case, air holes respectively formed on faces at the same height as both sides of a discharge part of the scroll case, and a blocking portion formed on the connection cover to close one of the air holes. The air conditioner can reduce investment costs, development expenses and the development period of time because all parts excepting an intake duct can be used commonly in RHDs (Right Handle Drives) and LHDs (Left Handle Drives) and can reduce a loss of air volume because air holes for cooling a motor are formed at positions to minimize resistance of the air discharged from a scroll case.