To provide a manufacturing method of metal components having the initial stage of forming the metal components of a metal having the thixotropic structure in a semi-solidified condition so that the metal components represents the excellent mechanical characteristics and weight-reducing characteristics.

In the manufacturing method of metal components 7, 8 and 9, and having first steps 10, 110 to form the metal components 7, 8 and 9 of a metal having the thixotropic structure in a semi-solidified condition, at least one of the metal components 7, 8 and 9 are blasted by flying bodies 2, and cold-processed, and the manufacturing method of the metal components 7, 8 and 9 are characterized to have the continuous cooling treatment steps 30 and 140. In the wheel 9 having the wheel rim 8 and the metal disk 7 welded to the wheel rim 8, the metal disk 7 of the wheel 9 is manufactured by the manufacturing method.