A compressor includes a shell that defines an enclosed space inside the shell, an electric motor unit located in the enclosed space of the shell and configured to generate a driving force, and a compression unit located in the enclosed space of the shell and configured to compress refrigerant. The compression unit includes a cylinder and a piston that is configured to reciprocate in the cylinder based on the driving force transmitted from the electric motor unit. The shell includes a plurality of heat radiation fins that are located at an outer circumferential surface of the shell and that are configured to emit heat generated inside the shell to an outside of the shell.