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1. A wheel bearing device comprising: an outer member including an outer raceway face that is formed on an inner circumference of the outer member; an inner member including an inner raceway face that is formed on an outer circumference of the inner member; and a plurality of rolling elements that are interposed between the outer raceway face of the outer member and the inner raceway face of the inner member, the wheel bearing device further comprising a spline hole that is formed in a through hole of the inner member, wherein the spline hole includes a plurality of projections and a plurality of recesses, and a guide groove that is formed on an inner circumference of the spline hole, the guide groove through which a guide plate of a finishing broach is to be run, wherein the guide groove is formed by removing a projection, of the plurality of projections, between two adjacent recesses of the plurality of recesses, wherein a hardened layer and a non-hardened layer are formed in side surfaces of the guide groove, wherein a depth of the hardened layer changes such that the hardened layer has a wave-shape, wherein the hardened layer is a single layer, and wherein in a cross-section as viewed in an axial direction of the inner member, the hardened layer is formed over an entire depth of each projection of the plurality of projections, wherein the side surfaces of the guide groove include side surfaces of two projections of the plurality of projections, respectively, and are inclined relative to a radially outermost surface of the guide groove, wherein side surfaces of the guide plate are inclined along the side surfaces of the guide groove, wherein the guide groove is formed of the two adjacent recesses, of the plurality of recesses, that are circumferentially connected to each other, the plurality of recesses forming an uneven shape, and wherein a radial depth of the guide groove is the same as a radial depth of each of the plurality of recesses.
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