A connector portion of a hard disk device is provided with a recess portion that guides a connector portion of a holder device so as to align the connector portion of the holder device with the connector portion of the hard disk device. The connector portion of the holder device is provided with a guide projection that is guided by the recess portion. A connector body is attached to a holder body shiftable within a range that the connector portion of the holder device can follow the connector portion of the hard disk device and a range that the guide projection can be guided by the recess portion.
