A collar for a vehicle sun visor includes a pair of collar halves attached on a shaft body. The collar halves each include a receiving groove, a first locking hole and a second locking hole, and a first flexible claw and a second flexible claw. When the pair of collar halves is assembled, the flexible claw of one of the collar halves is inserted into and engages with the locking hole in the other of the collar halves, and the locking holes and the flexible claws are provided pair-wise and arranged opposite one another with the receiving groove therebetween.