Aimed at providing an electronic authentication system for a motorcycle excellent in the handlability and operability, operations of turning an ignition knob, and of opening a accommodation lid and a fuel lid, disposed in the front portion of the vehicle, are permitted, when agreement of ID information was judged. The steering bar was made unlockable by operating the ignition knob after agreement of the ID information was judged, and the seat was made unlockable by further operating the ignition knob.