Method of manufacturing a shaft member for a wheel hub assembly with rolling bearings

According to a method of manufacturing a flanged shaft member (1) having a plurality of flanges (21) used to fasten the shaft member to a wheel, when the flanges (21) are formed on a part between a shaft portion (10) and a fitting shaft portion (30) through lateral extrusion while a forged recess (35) is formed at a center of an end surface of the fitting shaft portion (30) with the use of a forging die apparatus for cold forging, each flange (21) is formed so as to be curved in a direction opposite to a direction, in which the flange warps due to springback caused after the lateral extrusion, by an amount corresponding to an amount of warpage due to the springback.