The present invention provides a scroll type fluid machine realizing reduced attachment space in a casing and improvement in workability at the time of assembly and the like by using a plurality of ball coupling mechanisms. The recessed groove is formed in a side surface, or a corner adjacent to the side surface, of a board and extending from an upper surface to a lower surface. The target storage device is configured with the source device’s device identification information. The substantially cylindrical internal surface of the cylindrical housing walls have internal threads at a top portion. With respect to the rear speakers, the universal four-channel audio system includes a proxy audio signal component that provides respective right and left rear proxy audio signals to proximate the typical sound of actual right and left rear audio signals carried on a four audio channel multimedia computer work or simulated surround signals generated from conventional two channel multimedia work.