PURPOSE: To increase heat radiating efficiency of an oil cooler pipe by providing an oleophilic member on the outside of an oil cooler pipe which is provided in a closed casing and soaked in a lubricating oil, and keeping said pipe always wet due to the capillary phenomenon of said oleophilic member.

CONSTITUTION: A motor part 2 and a compressing mechanism part 3 are housed, while a lubricating oil 4 is also enclosed, in a closed casing 1. And, the lower part of an oil cooler pipe 9 which is formed into a loop shape, is soaked in the lubricating oil 4. The pipe 9 is covered by a metal mesh 15 of an oleophilic material. And, a pair of refrigerant spraying pipes 16a are provided for spraying a discharged refrigerant upon the pipe 9. Thereby, a refrigerant gas which is compressed by the compressing mechanism part 3 is discharged from the refrigerant spraying pipes 16a and sprayed upon the metal mesh 15, making the refrigerant gas itself carry out heat exchange. Also, the lubricating oil 4 exchanges heat with the pipe 9 while it flows down the metal mesh 15.