To prevent air leakage, facilitate manufacture, reduce costs, secure a design and so on by using an extendable material-made rim having a normal shape.

This disk wheel comprises a rim made of extendable material 1 having a normal shape, a disk fitting curved surface 8 which is tapared at the angle of 5° to be fitted to a rim sheet rear surface at the outer peripheral edge thereof, and a board disk 2 which has a beveled part 6 on the side of a design surface at the outer peripheral edge. A surface distance L between a flange vertical surface 9 on the side of a rim front surface and a fitting weld zone top 10 on the side of the disk is made short. They are welded at the disk outer peripheral beveled part 6, and then, a front surface of a weld 3 thereof is cut to be finished.