To provide a device, installed on a mover such as a hull or a vehicle for changing centrifugal force for allowing the mover to safely and smoothly curve into the force in a fixed direction.

A hollow elongate container storing a movable object in the interior thereof is continuously rotated around the central part up to 360°. While the end of the container is located between 0° and 180°, the inside object 4 is moved to be rather closer to the end, and while it is located between 180° and 360°, the object is moved to be rather closer to the end on the opposite side, whereby the mass of the end between 0° and 180° is increased.