PURPOSE: To control a vehicle to be restored to its attitude and surely prevent the vehicle from its accident of tumbling or the like, by promptly correcting a change of car height due to centrifugal force at a drive of running on a curved road.

CONSTITUTION: It is decided by timer circuits 17, 18 whether or not a signal output from comparator circuits 13, 14 is lasting for a length above the reference time. The timer circuit 17 comprises two inverter circuits IN1, IN2, resistors R1, R2, capacitors C1, C2 and a transistor TR1. If a piston 4a is moved by a distance l1 or more, that is, car height is decreased by the distance l1 by increasing a load on a vehicle, a signal of level "1" is output from the circuit 13 and respectively input to an AND circuit 19 and the timer circuit 17, as the result, charged electricity of the capacitors C1, C2 in the timer circuit 17 is discharged through the resistor R1, in this way, terminal voltages of those capacitors are decreased.