In a compressor of the present invention, an intermediate pressure port 37 through which a first discharge chamber 25 and a motor chamber 29 communicate with each other is formed in a front housing 11. A refrigerant having an intermediate pressure is discharged to the first discharge chamber 25. Consequently, it is possible to guide the refrigerant having the intermediate pressure in the first discharge chamber 25 to the motor chamber 29, and cool an electric motor 5, which generates heat during actuation, with the refrigerant having the intermediate pressure. In the compressor, a first impeller 7 and a second impeller 9 are disposed such that large diameter portions of the first impeller 7 and the second impeller 9 face each other. The second impeller 9 is smaller in diameter than the first impeller 7. Therefore, in the compressor, a first thrust force generated on the first impeller 7 side and a second thrust force generated on the second impeller 9 side act to offset each other. A resultant force of the first and second thrust forces decreases.