To provide a wheel easily moving over a gap of stairs having no riser, requiring less force for pulling a movable body in rising the stairs, and causing less vibration and shock.

This wheel is constructed of an axle 11 installed to the movable body 1, a rotational body 12 installed to the axle 11 freely rotationally and provided with at least three vertexes on its outer circumference in the rotationally symmetric positions mutually around the axle 11, and rollers 13 respectively installed to the vertexes of the rotational body 12 freely rotationally. In the outer circumference of the rotational body 12, slidable guide faces 12s with low frictional resistance are arranged between the adjacent vertexes. A wheel 10 can smoothly move on the road surface, and when a corner C of a step is slid on the guide face 12s, the movable body 1 can be lifted with the rotational body 12 even the stairs have no riser A, while pulling force for pulling the movable body 1 can be reduced, and consequently, the movable body 1 can be lifted continuously through the stairs consisting of a plurality steps.