To provide a method of manufacturing a wheel bearing device allowing reduction of manufacturing cost, while reducing weight.

This wheel bearing device includes a flanged shaft member 1 having a shaft portion 10 to which a rolling bearing 41 is assembled, a fitting shaft portion 30 fitted with a center hole of a wheel, and a plurality of flange portions 21 extended radially in the outer diameter direction on an outer peripheral surface located between the shaft portion 10 and the fitting shaft portion 30 and penetrated with bolt holes 24 of hub bolts 27. When manufacturing the wheel bearing device, the bolt holes 24 are formed in the flange portions 21 after forming the flange portions 21 on the outer peripheral surface of an intermediate shaft portion 20 between the shaft portion 10 and the fitting shaft portion 30, while forming a forged recess 33 at an end face of a center portion of the fitting shaft portion 30 by side extrusion of cold forging. Subsequently, a bolt seat surface 21c around an opening edge on one side of each of bolt holes 24 of the flange portions 21 is finished into a flat surface by coining.