PURPOSE: To reduce oil rising by effectively separating oil mist which is mixed in discharged oil after oil supply to a bearing or in discharged gas with a simple structure.

CONSTITUTION: A discharge pipe 9 is opened to an inner space of a sealed casing 1. The discharge pipe 9 is also opened to substantially the same position as an outer rotation trace of a balance weight 15 or an inner position in its diameter position, between a rotor 16 of a motor 6 and the upper balance weight 15 provided on a driving shaft 5 on the side of a compression element.