Patent ID: 8400267

Claim:
A vehicle authentication device comprising: an in-vehicle device mounted on a vehicle; an authentication unit disposed in the in-vehicle device, for matching an ID returned from a portable device in response to a request from the in-vehicle device and performing an authentication of the vehicle, and an operation switch for instructing a power supply transition of the vehicle; wherein the operation switch is an operation push button switch, wherein the in-vehicle device comprises: a measurement unit for measuring a duration of an active state of the operation switch, a determination unit for determining whether the duration exceeds a predetermined time, and a control unit for executing a power supply transition control of the vehicle based on a simultaneous occurrence of the determination that the duration time of the active state of the operation switch exceeds the predetermined time made by the determination unit and an authentication result of the authentication unit that the portable device is legitimate, and wherein the active state is a state in which the operation switch is pushed.