COMPRESSOR

A compressor subjects a fluid compressed by a first impeller to further compression by a second impeller. The compressor includes an impeller housing including a first housing accommodating the first impeller, and a second housing accommodating the second impeller, and an interstage component coupled to the impeller housing, and forming, together with the impeller housing, an interstage passage configured to introduce the fluid from the first impeller into the second impeller. The interstage passage includes at least one curved passage. The curved passage includes an inner wall surface that is curved on an inner side in a cross-section passing through a center line of the curved passage, and an outer wall surface that is curved on an outer side in the cross-section. One of the inner wall surface and the outer wall surface is formed in the impeller housing. Another of the inner wall surface and the outer wall surface is formed in the interstage component.