The invention relates to a vehicle-height adjusting system capable of enabling a vehicle to well pass an uneven road surface and suppressing inclination of the vehicle after the vehicle returns to an even road. In the vehicle-height adjusting system, under the condition of an uneven road surface, aiming at each of vehicle-height adjusting actuators corresponding to left side wheels and right side wheels of at least one side of a front wheel side and a rear wheel side, the supply amount of a pressure medium is substantially the same. Thus, if the vehicle height of the wheels rises, the vehicle can well pass an uneven road surface. In addition, since the supply amount of the pressure medium of the vehicle-height adjusting actuators of the left side wheels and the right side wheels is the same, inclincation of a vehicle body in the left-right direction after the vehicle passes the uneven road surface can be suppressed.