PURPOSE: To prevent the lubrication inferiority at sliding part, etc., by providing a guide passage which guides the gas fluid discharged from the discharge port of a compressing element into a gas passage.

CONSTITUTION: The gas liquid discharged from the discharge port 64 of a compressing element 6 through a guide passage 8 is guided to a gas passage 7 and discharged into the secondary space S2. Therefore, the air cut part 22 provided around the stator 2 of a motor 4 can be secured as a oil return passage at the time of returning the oil separated from gas fluid on the side of the secondary space S2 to the oil bank at the bottom of a casing 1. Accordingly, the separated oil can be returned smoothly from the secondary space 82 to the oil bank without the return of the separated oil being hindered, interfering with the discharge gas reaching the secondary space 82, at return of oil from the secondary space S2 to the oil bank side. Hereby, the lubrication inferiority at a sliding part, etc., can be prevented.