A connector installed in a casing containing an electronic device such as a car navigation device is coupled to another connector installed in a memory device such as a hard disc. The connector includes a support member composed of a back plate and side plates connected to the back plate. The connector is disposed on the back plate, and coupling guides to be coupled to guiding grooves formed on the memory device are formed integrally with the side plates. The coupling guides are slid into the guiding grooves to correctly position the connector relative to the memory-side connector when the memory device is coupled to the casing containing the connector. Thus, the connector is surely coupled to the memory-side connector at a right position to establish electrical connection between two connectors.