PURPOSE: To improve the appearance and rotating balance of an assembly type wheel for vehicle respectively by providing a bolt for fixing a rim and a disc with a valve function and opening the bolt-through hole of the wheel in a tire.

CONSTITUTION: A bolt used in a wheel for vehicle is provided with a valve function. In a hexagon socket head cap screw 20, for example, a valve core 2 is embedded. In the hexagon socket head cap screw 20, a hexagon socket part 3 for engaging a spanner, and an opening 4 are formed respectively. An air valve bolt 1 is constituted of a valve in which the valve core 2 is built. The air valve bolt 1 is used to fix the rim 5 and the disc 6 of a two-piece wheel, for example. In the rim 5, a threaded hole 7 for screwing the air valve bolt 1, and a hole 8 for passing through coaxially are formed respectively, and a part of hole 8 is opened inside the tire to be fitted onto the rim 5.