This paper proposes the saddle type human body motion interface for personal mobility. The proposed interface uses not only conventional translational body motion but also twisting motion, and makes easy operation. The saddle is attached on the personal mobility by using the seat post with the universal joint at the floor of the personal mobility. The universal joint has three rotational joints where the potentiometers are attached on each. Hip motion makes these joints rotate. The potentiometers detect these rotations, and then this interface measures the hip translational and twisting motions. This saddle does not support whole user body weight, but it is sandwiched by legs and follows the hip motion. User keeps his/her standing position by strengths own legs. The saddle type interface doesn't need pre-setting for the operation, since this system doesn't require any sensors on the human body. By the basic experimental result, it turned out that proposed interface can operate personal mobility and has a potential for intuitive operation.