A centrifugal compressor comprising: an impeller that is mounted on a rotor shaft, and compresses fluid flowing in from an intake, and then discharges the compressed fluid from a discharge port; an inlet casing that houses the impeller; a scroll section that is disposed on an outer peripheral side with respect to the inlet casing, and has a scroll casing forming a volute chamber into which the compressed fluid discharged from the discharge port flows; a bearing pedestal having a bearing section for supporting the rotor shaft, and a flange section for supporting the scroll section; a plurality of flange section fastening bolts that fasten the flange section to the scroll casing at a plurality of fastening positions around the axial line of the rotor shaft, and extend in the direction of the axial line; characterized in that the centrifugal compressor further comprises: a plurality of clamp members having recesses which surround an outer peripheral edge of the flange section and an outer peripheral edge of the scroll casing from an outer peripheral side, and through holes which are opened to the recesses, and extend in the direction of the axial line, wherein one of either the flange section or the scroll casing has a plurality of fastening holes extending in the direction of the axial line, in a peripheral direction around the axial line, one of either the flange section or the scroll casing, and the clamp members are fastened to each other by clamp member fastening bolts inserted into the through holes and the fastening holes, and predetermined gaps are provided between an end face in the direction of the axial line of the other of either the flange section or the scroll casing, and end faces in the direction of the axial line of the recesses. an impeller that is mounted on a rotor shaft, and compresses fluid flowing in from an intake, and then discharges the compressed fluid from a discharge port; an inlet casing that houses the impeller; a scroll section that is disposed on an outer peripheral side with respect to the inlet casing, and has a scroll casing forming a volute chamber into which the compressed fluid discharged from the discharge port flows; a bearing pedestal having a bearing section for supporting the rotor shaft, and a flange section for supporting the scroll section; a plurality of flange section fastening bolts that fasten the flange section to the scroll casing at a plurality of fastening positions around the axial line of the rotor shaft, and extend in the direction of the axial line; characterized in that the centrifugal compressor further comprises: a plurality of clamp members having recesses which surround an outer peripheral edge of the flange section and an outer peripheral edge of the scroll casing from an outer peripheral side, and through holes which are opened to the recesses, and extend in the direction of the axial line, wherein one of either the flange section or the scroll casing has a plurality of fastening holes extending in the direction of the axial line, in a peripheral direction around the axial line, one of either the flange section or the scroll casing, and the clamp members are fastened to each other by clamp member fastening bolts inserted into the through holes and the fastening holes, and predetermined gaps are provided between an end face in the direction of the axial line of the other of either the flange section or the scroll casing, and end faces in the direction of the axial line of the recesses. a plurality of clamp members having recesses which surround an outer peripheral edge of the flange section and an outer peripheral edge of the scroll casing from an outer peripheral side, and through holes which are opened to the recesses, and extend in the direction of the axial line, wherein one of either the flange section or the scroll casing has a plurality of fastening holes extending in the direction of the axial line, in a peripheral direction around the axial line, one of either the flange section or the scroll casing, and the clamp members are fastened to each other by clamp member fastening bolts inserted into the through holes and the fastening holes, and predetermined gaps are provided between an end face in the direction of the axial line of the other of either the flange section or the scroll casing, and end faces in the direction of the axial line of the recesses.