PURPOSE: To obtain a strong and cheap wheel lock by providing an annular groove on the inner peripheral surface of the tip of a nut and providing a cam coupling with this annular groove on a cylindrical case covering this nut and housing an electronic lock in the wheel lock to prevent the theft of a wheel.

CONSTITUTION: When the disk of a wheel is tightened to a hub using several bolts and nuts, a nut N for a wheel lock is screwed to one of the bolts, then a case 10 incorporated with an electronic lock E is put on this nut N to cover its hexagnal faces. At this time, the case 10 is fully pushed in while compressing a return spring 37, a cam 30 is made to face an annular groove 9, and a protruded stripe 28 at the tip of an annular band 22 of a lock proper 21 is engaged with an annular notch 7 on the end face of the nut N. Next, a key 41 is inserted into a recess 12 and turned, the side edge of the cam 30 is inserted into the annular groove 9 by the rotation of a rear plate 34 to prevent the case 10 from comming off, then the key 41 is removed, and individual magnets 40... are entered into recesses 20... by a spring 39 to perform the lock.