PURPOSE: To keep a car body in horizontality at all times by driving and controlling a drive mechanism which expansively drives a symmetrical pair of leg parts each simultaneously or separately in the operating state of a tilting switch, in a motorcycle.

CONSTITUTION: When a operating lever 8 is pulled from a horizontal holding state of a car body by a driver, and symmetrical leg parts 12L, 23R are uprighted, symmetrical motors 35L, 35R are rotated clockwise, an inner cylinder 30 expands simultaneously from these leg parts 23L, 23R, a right-hand leg member 38 is first grounded, pushing the car body and being tilted to the left, whereby a tilting switch operates, and the right-hand motor 35R comes to a stop, thus only the left-hand inner cylinder 30 is extended. When the left-hand leg member 38 is grounded, the car body is restored to its original horizontal position, and this fact is detected by the tilting switch, and afterward a body front part is uplifted in leaving the car body maintained in the horizontality intact by drive of both these motors 35L, 35R, and it is completely uplifted, these motors 35L, 35R are stopped, holding the car body in the horizontality as it is.