To miniaturize an outer shape of a compressor without worsening efficiency of the compressor.

A compressor body 2 is provided with a suction side casing part 11 and a discharge side casing part 21. A cylinder 8 forms a flange part 47 whose peripheral fringe part is extended in the direction of outer periphery in a connection part with the discharge side casing part 21. A gas-liquid separation device 3 is provided with a receiver tank 41 and a separator 42. An end connection 43 connecting the separator 42 is provided in an upper part of the receiver tank 41. Only the discharge side casing part 21 of the compressor main body 2 is inserted into the inside through an opening 44 of the receiver tank 41. A lid is applied to the opening 44 of the receiver tank 41 by the flange part 47 formed in the connection part with the discharge side casing part 21 of the cylinder 8 to connect the flange part 47, the receiver tank 41, and the cylinder 8 mutually.