Abstract: A compressor includes a cylindrical casing, a bundle 3 which includes a tubular stationary member and a rotor accommodated into the stationary member, and is inserted into an inner portion of the casing, and a roller 11 configured to roll on an inner circumferential surface of the casing while supporting the bundle 3 when the bundle 3 is inserted into the inner portion of the casing along an axial direction. An outer circumferential surface 23 of the roller 11 is formed in a continuous convex curved surface so that a curvature radius of an end side along a rotating shaft 21 of the roller 11 is smaller than a curvature radius of a center.