To adjust car height at positions of four wheels of a vehicle during stopping without generating hunting by only using three car height sensors.

A first/second car height sensor are provided respectively in a right/left front wheel position, also a third car height sensor is provided by only one in an intermediate position between right/left rear wheel positions. By alternately processing steps 206 to 216 and steps 218 to 222, not changing of a warp amount during stopping of a vehicle and ratio of a car height change amount of a right rear wheel position relating to the third car height sensor position to a car height change amount of a right rear wheel position relating to a left rear wheel position equal to a ratio of a distance from the third car height sensor to the left rear wheel position to a distance between both rear wheels are utilized, a car height in the right/left rear wheel positions is gradually changed accurately by a fine amount ΔH1.