To provide a four-wheeled vehicle capable of stably turning in a relatively small radius of turning.

Right and left wheels on one side out of right and left wheels before and behind with running torque by a drive source not transmitted are made turnable with a shaft vertical to the ground surface taken as the center. When a turn mode command is generated in accordance with operation, a judgement is made whether an operating condition of a vehicle satisfies a prescribed condition or not. When this prescribed condition is judged to be satisfied, the right and left wheels on the one side are turned from a straight advancing position at vehicle running time to an angular position along a tangential direction of a circular arc passing a shaft vertical to the ground surface of the right and left wheels on the one side with the vicinity of the central point between vehicle running turn shafts of right and left wheels on the other side out of the right and left wheels before and behind taken as the center, rotational torque is given to the right and left wheels on the one side in the angular position along the tangential direction, and a car body is turned with the vicinity of the central point between the vehicle running turn shafts of the right and left wheels on the other side taken as the center.