A multistage centrifugal compressor includes a rotating shaft; a first impeller and a second impeller fixed to the rotating shaft; and a casing configured to surround the rotating shaft and the first and second impellers, that forms a first diffuser channel allowing the flowing through of a fluid which is discharged from the first impeller, that forms a first return channel, that forms a second diffuser channel allowing the flowing through of the fluid which is discharged from the second impeller, that forms a second return channel, wherein the first impeller is disposed adjacent to the second impeller in the axial direction of the rotating shaft, in the first diffuser channel, a vaneless diffuser is disposed, and in the second diffuser channel, a vaned diffuser having multiple vanes is disposed.