PURPOSE: To raise of the amenity of car by generating a force to counter-balance centrifugal force so as to direct the resultant force of gravity exerting on the gravity center of a person and a centrifugal force to the center of body.

CONSTITUTION: A centrifugal force sensor converts centrifugal force into an electric signal, and then a servo-motor is driven through a signal-discerning comparator by which the content of the signal can be converted into +, 0, - stepped currents in such a way that the resultant force of centrifugal force and gravity can be controlled so as to make it almost coincide with the center line of the body of a person. Thus, the action of centrifugal force can be effectively controlled over all the area of residential space.