A compressor comprises a casing, a bundle which is housed inside the casing, and an inner roller which is provided at a front of the bundle in the inserting direction and rolls on an inner circumferential surface of the casing, a sealing surface protruded from the inner circumferential surface toward an inner circumferential side of the casing in a radial direction, a recess which is provided on the inner circumferential surface and in which the inner roller is settled when the bundle is housed inside the casing, a sealing member provided on an outer circumferential surface of the bundle and abutting on the sealing surface of the casing when the bundle is housed inside the casing. An extension part extending the sealing surface to a front side thereof in the insertion direction of the bundle is provided in the inner circumferential surface of the casing.