A supporting apparatus includes a connector, a first hook portion and a second hook portion. The connector is connected to a signal terminal provided at a bottom portion of a portable computer that is chosen from a plurality of electronic devices having different sizes which are dimensions measured from the bottom portions to outer peripheral edges of the portable computes. The first hook portion is provided with respect to the connector in a position corresponding to that of the outer peripheral edge of one of the portable computers. The second hook portion is provided with respect to the connector in a position corresponding to the outer peripheral edge of another of the portable computers.