To provide wheel structure with reduced weight of a disk wheel.

In this wheel structure, the disk wheel 12 has a rim 20, to which a tire is to be fitted. A tire support means has a tire support part for supporting a side surface of the tire fitted to the rim 20, and detachably fitted to the rim 20 by pinching an outside surface of the rim 20 in the radial direction and an inside surface thereof in the radial direction. The rim 20 is provided with a flange having a projection part projecting outside in the radial direction from a tire fitting surface, to which the tire is to be fitted. The tire support means pinches an outside surface of the flange in the radial direction and an inside surface thereof in the radial direction.