VEHICLE WITH SMART KEY SYSTEM

Provided is a vehicle with a smart key system that can suppress damage to vehicles original driving performance. The vehicle includes a driving control unit for controlling driving of the vehicle. An in-vehicle device includes: an in-vehicle communication unit including an in-vehicle transmitter for transmitting a search signal for searching a mobile device at a predetermined field strength; and a communication control unit for controlling communication of the in-vehicle communication unit. The in-vehicle device or the mobile device includes a control switch for starting or stopping a main power supply of the driving control unit. After the main power supply of the driving control unit is started by the control switch and at least before the vehicle starts driving, the communication control unit controls the in-vehicle transmitter to implement a limitation to set a low or zero field strength of the search signal transmitted from the in-vehicle transmitter.