To solve the problems in an angle changing and moving method by a rotating body, and a moving body such that the moving body is moved by kicking an object such as the ground backwardly; however, the moving body is moved depending on the object, and the movement of the body caused by the linear action/reaction slips according to the state of the object, and causes troubles such as an accident due to insufficient braking or the like.

A moving body is moved by kicking an object 4 backwardly by a rotary shaft 6 at a center of a long hole 10 formed in the center of a rotating body 9. When a trouble occurs by the slip of the object 4, the rotary shaft 6 is shifted to a rotary shaft 6' to generate the lateral movement component at a right angle thereto.