A centrifugal compressor comprising: an impeller which is mounted on a rotor shaft and configured to compresses a fluid flowing in from an intake port and discharge a compressed fluid from a discharge port; an air inlet guide which accommodates the impeller, extends in a direction of an axis line of the rotor shaft, and is provided with a suction opening which is configured to suction the fluid; a scroll part which is disposed further toward the outer periphery side in a radial direction orthogonal to the direction of the axis line than is the air inlet guide and forms a scroll chamber into which the compressed fluid discharged from the discharge port can flow; and a fastening bolt (14, 14') which mounts the air inlet guide on the scroll part and is provided with a head (14a, 14'a) and a shank (14b, 14b'), wherein the scroll part is provided with an inner periphery-side end portion (17e, 17j) provided on the discharge port side, and an end portion provided on the suction opening side such that it is spaced-apart in the direction of the axis line from the inner periphery-side end portion (17e, 17j), a fastening hole (17g, 17k) to which a tip (14c, 14'c) of the shank (14b, 14'b) of the fastening bolt (14, 14') is fastened is formed in the inner periphery-side end portion (17e, 17j), a through-hole into which the shank (14b, 14'b) of the fastening bolt (14, 14') is inserted is formed in the end portion of the scroll provided on the suction opening side, and wherein the head (14a, 14'a) of the fastening bolt (14, 14'), is mounted on an end portion on the air inlet guide on the side of the suction opening, and the tip (14c, 14c') of the shank (14b, 14'b) is fastened to the fastening hole (17g, 17k). an impeller which is mounted on a rotor shaft and configured to compresses a fluid flowing in from an intake port and discharge a compressed fluid from a discharge port; an air inlet guide which accommodates the impeller, extends in a direction of an axis line of the rotor shaft, and is provided with a suction opening which is configured to suction the fluid; a scroll part which is disposed further toward the outer periphery side in a radial direction orthogonal to the direction of the axis line than is the air inlet guide and forms a scroll chamber into which the compressed fluid discharged from the discharge port can flow; and a fastening bolt (14, 14') which mounts the air inlet guide on the scroll part and is provided with a head (14a, 14'a) and a shank (14b, 14b'), wherein the scroll part is provided with an inner periphery-side end portion (17e, 17j) provided on the discharge port side, and an end portion provided on the suction opening side such that it is spaced-apart in the direction of the axis line from the inner periphery-side end portion (17e, 17j), a fastening hole (17g, 17k) to which a tip (14c, 14'c) of the shank (14b, 14'b) of the fastening bolt (14, 14') is fastened is formed in the inner periphery-side end portion (17e, 17j), a through-hole into which the shank (14b, 14'b) of the fastening bolt (14, 14') is inserted is formed in the end portion of the scroll provided on the suction opening side, and wherein the head (14a, 14'a) of the fastening bolt (14, 14'), is mounted on an end portion on the air inlet guide on the side of the suction opening, and the tip (14c, 14c') of the shank (14b, 14'b) is fastened to the fastening hole (17g, 17k).