To provide a running carrier running on a curved face, capable of running on the curved face in a condition in which an attitude of a device is stable or provided with sufficient driving force by bringing all of four wheels into contact with a running face without making even one wheel leave the running face in, for example, four wheels provided on the running carrier and provide a running carrier capable of running on the curved face in a condition in which the attitude of the device is stable or provided with sufficient driving force by bringing all of four wheels into contact with the running face without making even one wheel leave the running face in, for example, a four wheel belt vehicle holding a two system endless rail when the running carrier is provided with two system endless rail.

In the running carrier provided with a plurality of wheels or a means moving on a surface of an object such as a plurality of endless rails, a frame of the running carrier consists of two divided frames, the frame on one side is provided with an arc-shaped slide rail having a circular arc shape, and the arc-shaped slide rail is held by a slide guide provided in the frame on the other side so as to slide like a circular arc.