To provide a wheel system for a vehicle equipped with a power generation function, capable of stably generating electric power in a simple configuration by using rotation of wheels for a vehicle, without the need of a separate power source.

The wheel system for the vehicle includes: a coil 32 which has the same axis as a shaft line 35 toward the rotation center line 14 of the wheel 10 for the vehicle, at the outer circumferential face 11d side of a rim 11; a rotation side magnet 31 provided at the outer side of the coil 32 in a shaft line 35 direction; and a stationary side magnet 33 provided to a brake caliper 56 positioned at the inner circumferential face 11e side of the rim 11. Magnetic flux through the coil 32 is changed by the change of a relative position of the rotation side magnet 31 to the stationary side magnet 33 by the rotation of the wheel 10 for the vehicle, and electromotive force is generated in the coil 32.