A pressure equalizer of a compressor of an air conditioner comprises a bypass pipe installed between a refrigerant suction pipe and a refrigerant discharge pipe of a compressor, a valve housing connected to a middle portion of the bypass pipe and provided with a partition having a valve hole therein, and a switching valve elastically installed in the valve housing for selectively opening the valve hole by a pressure difference between the refrigerant suction pipe and the refrigerant discharge pipe.