To provide a wheel assembling structure of a vehicle capable of preventing the wheel certainly from being installed erroneously while the rotational balance of the wheel is well kept.

The wheel assembling structure of the vehicle is composed of a first wheel 2a arranged to be mounted on either of a front wheel hub 100a or rear wheel hub 100c of the vehicle and provided in the center with a first hole 128a, a second wheel 2c arranged to be mounted on the other wheel hub and provided in the center with a second hole 128c having a smaller diameter than the first hole 128a, and a projection 112a formed in the rotational center of the first named hub and arranged as able to be inserted into the first hole 128a, wherein the outside diameter of the projection 112a is made greater than the inside diameter of the second hole 128c.