PURPOSE: To make a stable lubrication to a bearing unit of a shaft, by providing a projecting plate projecting upwardly in an axial direction at the bottom of a closed casing housing a machine unit and a motor and preventing the rotation of lubricating oil by the projecting plate.

CONSTITUTION: A motor 2 and a machine unit 5 are housed in a closed casing 1. When a rotor 3 and a shaft 9 rotate, refrigerant is introduced into a compressing chamber 8 from an inlet hole 6 through an inlet pipe 12. The refrigerant is gradually compressed, discharged into the casing 1 through a discharge hole 7 once and then discharged through a discharge pipe 13. Further, lubricating oil 14 staying on the bottom of the casing 1 is supplied to a bearing unit 11 through a lubricating hole 10 of a shaft 9. There is provided a projecting plate 15 projecting upwardly in an axial direction at the bottom of the closed casing 1 in the arrangement mentioned above. Thus, rotation of the lubricating oil 14 is prevented by the projecting plate 15 and the lubricating hole 10 is immersed in the lubricating oil 14 at all times, whereby lubrication to the bearing portion of the shaft 9 is stabilized.