A rotor for a centrifugal compressor includes: a rotor main; an impeller; and a contact member. The rotor main body extends in an axis direction and includes a recessed part that is disposed on an outer circumferential surface. The impeller includes: a cylinder part having a cylindrical shape that extends around the axis direction and includes an inner circumferential surface with a fitting region tightly fitted to the outer circumferential surface of the rotor main body; an annular disc that extends from the cylinder part to a radial outer side with respect to the axis direction; a plurality of blades disposed at intervals in a circumferential direction on a surface facing one side in the axis direction of the annular disc; and a cover that covers the plurality of blades from the one side in the axis direction. The contact member is fitted into the recessed part.