PURPOSE: To make it possible to stably attach a weight to a wheel, by engaging a projection formed on a weight in a fitting groove formed in the rim of a wheel.

CONSTITUTION: A wheel 1 as a front wheel of a tractor, is formed, in the outer end part of the inner peripheral surface 3 of a rim 2, with a fitting groove 8 directing toward the wheel. Further a cut and raised part 11 is formed inside of a disk 9. Meanwhile a weight 6 is formed with a projection 7 fitted in the above-mentioned groove 8 and a projecting part 10 engaged with the above- mentioned cut and raised part. Upon attachement of the weight 8 to the wheel 1 the projection 7 of this weight 6 is fitted into the groove 8 while the projecting part 10 is engaged with the cut and raised part 11, and thereafter, the weight 8 is attached to the weight to the disk 9 by means of a bolt 12.