A centrifugal compressor, comprising: a housing; an impeller disposed rotatably inside the housing and comprising a hub with an attachment hole and a plurality of blades integrally provided with the hub; wherein the centrifugal compressor further comprises a drive shaft comprising a shaft section extending inside the attachment hole of the impeller, a stepped section separated from the impeller, and a middle section disposed between the shaft section and the stepped section; a fastening member screwed to a distal end side of the shaft section; at least one flange portion fitted onto the middle section; a thrust member fixedly disposed relative to the housing and comprising a through hole through which the drive shaft is inserted and a thrust section which is disposed around the through hole and which contacts the flange portion; and a sleeve section fitted onto the middle section and disposed between the flange portion and the impeller, wherein an inner peripheral surface of the attachment hole comprises a clamp surface which is in close contact with the shaft section by shrink fitting, characterized in that the centrifugal compressor further comprises a diameter-widening surface with an inner diameter which increases with a distance from the clamp surface in an axial direction of the attachment hole, wherein an outer peripheral surface of the sleeve section comprises a diameter-reducing surface with an outer diameter which reduces toward the clamp surface in the axial direction of the attachment hole, wherein the diameter-widening surface and the diameter-reducing surface respectively comprise an impeller-side contacting portion and a sleeve-side contacting portion which contact each other, and wherein a relationship represented by an expression θs < atan (d/L) is satisfied, where d is a length from an axis of the attachment hole to the sleeve-side contacting portion in a radial direction of the attachment hole, L is a length from the sleeve-side contacting portion to the clamp surface in the axial direction of the attachment hole, and θs is a sleeve inclination angle formed by an intersection of an axis of the sleeve section and a generatrix of a virtual cone which contacts the diameter-reducing surface at the sleeve-side contacting portion. a housing; an impeller disposed rotatably inside the housing and comprising a hub with an attachment hole and a plurality of blades integrally provided with the hub; wherein the centrifugal compressor further comprises a drive shaft comprising a shaft section extending inside the attachment hole of the impeller, a stepped section separated from the impeller, and a middle section disposed between the shaft section and the stepped section; a fastening member screwed to a distal end side of the shaft section; at least one flange portion fitted onto the middle section; a thrust member fixedly disposed relative to the housing and comprising a through hole through which the drive shaft is inserted and a thrust section which is disposed around the through hole and which contacts the flange portion; and a sleeve section fitted onto the middle section and disposed between the flange portion and the impeller, wherein an inner peripheral surface of the attachment hole comprises a clamp surface which is in close contact with the shaft section by shrink fitting, characterized in that the centrifugal compressor further comprises a diameter-widening surface with an inner diameter which increases with a distance from the clamp surface in an axial direction of the attachment hole, wherein an outer peripheral surface of the sleeve section comprises a diameter-reducing surface with an outer diameter which reduces toward the clamp surface in the axial direction of the attachment hole, wherein the diameter-widening surface and the diameter-reducing surface respectively comprise an impeller-side contacting portion and a sleeve-side contacting portion which contact each other, and wherein a relationship represented by an expression θs < atan (d/L) is satisfied, where d is a length from an axis of the attachment hole to the sleeve-side contacting portion in a radial direction of the attachment hole, L is a length from the sleeve-side contacting portion to the clamp surface in the axial direction of the attachment hole, and θs is a sleeve inclination angle formed by an intersection of an axis of the sleeve section and a generatrix of a virtual cone which contacts the diameter-reducing surface at the sleeve-side contacting portion. d is a length from an axis of the attachment hole to the sleeve-side contacting portion in a radial direction of the attachment hole, L is a length from the sleeve-side contacting portion to the clamp surface in the axial direction of the attachment hole, and θs is a sleeve inclination angle formed by an intersection of an axis of the sleeve section and a generatrix of a virtual cone which contacts the diameter-reducing surface at the sleeve-side contacting portion.