To reduce a size of a solenoid coil of a control valve of external control type and reduce power consumption.

This compressor is constituted in such a way that a communicating passage on a low pressure side is constituted so that refrigerant as a medium flows around a solenoid coil 57 of a control valve Cv of external control type. That is, the solenoid coil 57 of the control valve Cv is arranged in such a manner that it faces a pressure chamber on suction side 13 of a rear head 15 through a bulkhead 71, and a hole part 72 is formed in a section facing the solenoid coil on the bulkhead. Furthermore, a partition wall 75 is provided in the pressure chamber on suction side of the rear head so that the inflow refrigerant flows toward the hole part 72.