Abstract: A reciprocating piston type compressor for compressing refrigerant gas for an automobile air conditioning system is provided with a cylinder block assembly which includes a plurality of cylinder bores, a swash plate chamber and an oiler channel which extends along the one of the end walls of the swash plate chamber. When the refrigerant gas, which flows rotationally in the swash plate chamber due the rotating swash plate, contacts the oiler channel, the lubricating oil mist, in the refrigerant gas flow in the swash plate chamber induced by the rotation of the swash plate, is separated from the refrigerant gas and the separated lubricating oil is introduced into the bearing means by the oiler channel.