Patent ID: 7679486

Claim:
An in-vehicle antitheft device provided in a vehicle, comprising: first permitting means for permitting use of at least one of vehicle functions, which has been unpermitted to use, until said vehicle travels a predetermined distance when an authentication by an in-vehicle authentication device is completed in agreement; transmitting means for transmitting a request signal of requesting a user authentication to an exterior of said vehicle through a communication line; and second permitting means for permitting the use of said at least one of the vehicle functions by extending said predetermined distance when the user authentication is completed in agreement in the exterior of said vehicle until said vehicle travels said predetermined distance, wherein said predetermined distance is permitted by said first permitting means for the first time after an ignition is turned off while at an incommunicable state with the exterior of said vehicle and is set to a distance longer than a travel distance from a last communicable position before turning off the ignition to a position at which the ignition was turned off.