To provide a wheel wherein adhesion of an antifreezing agent to a fitting portion of a wheel and an axle portion causes no problem when attaching and detaching, and a tyre is easily changed.

The wheel 1 has a hub opening 2 having a small diameter portion 4 parallel relative to its rotational axial direction and (a) large diameter portion(s) 5 with a larger diameter than the small diameter portion, the small diameter portion satisfy the diameter and the tolerance established in a specification, and the large diameter portion(s) is (are) arranged in the inlet side and/or outlet side of the hub opening. The large diameter portion(s) may include a draft angle portion or a step portion or others. Preferably, the small diameter portion and the large diameter portions are formed symmetrically relative to the center of the wall thickness of the wheel.