A method for assembling a wheel bearing apparatus includes disposing a positioning jig such that a lateral face of the positioning jig on one side in an axial direction contacts a lateral face of a hub flange on a side of a slinger, the positioning jig having a ring shape separated into a plurality of partial portions arranged in a circumferential direction, a width of the positioning jig in the axial direction being equal to a distance between a lateral face of a disc portion on a side of the hub flange and a lateral face of the hub flange on the side of the slinger, the distance being set to obtain an appropriate interference; and attaching the slinger such that the lateral face of the disc portion on the side of the hub flange contacts a lateral face of the positioning jig on another side in the axial direction.