A mobile vehicle 1 has two wheels 5, 5 on the rear side of a vehicle body 3, and is capable of causing a roll driving moment to act on the vehicle body 3 by an actuator 33 in a roll driving mechanism 23. A control device 70 controls the actuator 33 such that the function characteristics of the roll driving moment implemented by the control of the actuator 33 with respect to a vehicle body roll angle (inclination angle in the roll direction of the vehicle body 3) become as shown in FIG. 6A or 6B.