A compressor including: a substantially tubular casing; a substantially cylindrical lid that is provided inside an inner periphery of the casing so as to close off both ends of the casing; a space that is enclosed by the lid and an inner circumferential surface of the casing so as to accommodate a blade; and a seal member that is provided so as to extend in a circumferential direction on the space side of an outer circumferential surface of the lid. A recessed portion, extending inward in the radial direction from the outer circumferential surface of the lid, is provided on the lid at a position between the seal member and the end surface at the space side of the lid.