A vehicular height regulating system monitors a vehicular height level. The monitored height level is compared with upper and lower criteria which are higher than and lower than a predetermined target height level in a given magnitude. The system generally performs height adjustment for rising or lowering the actual vehicular height when the monitored vehicular height is out of a target height range defined by the upper and lower criteria. The system also monitors an a preselected vehicular driving parameter which reflects vehicular running condition. The system adjusts the upper and lower criteria depending upon the monitored vehicular driving parameter.