Patent ID: 8770852

Claim:
A wheel bearing device, comprising: a cylindrical inner shaft that has a first end portion to which a wheel is fitted on an outboard side; an inboard side disposed axially opposite from the outboard side; an outer ring that is arranged radially outward of the inner shaft so as to be concentric with the inner shaft with double-row rolling elements interposed between the outer ring and the inner shaft; and an inner ring member that has an outer periphery having a raceway for the rolling elements in one of the rows, which is located axially inward of the other one of the rows, and that is fitted to an outer periphery of a second end portion of the inner shaft, located opposite to the first end portion, wherein an inner periphery of the inner shaft, which defines a center hole, has spline grooves that are respectively spline-fitted to a plurality of spline teeth formed on an outer periphery of a drive shaft that is inserted into the center hole of the inner shaft; an annular clearance is formed between the inner ring member and the second end portion of the inner shaft from an outboard side end face of the inner ring member in an axial direction to an axial end point that does not reach an inboard side end face of the inner ring member; and the spline teeth of the drive shaft extend from the outboard side to the inboard side to overlap an axial range of the annular clearance and do not reach the axial end point of the annular clearance.