A compact bearing device for a drive wheel is provided, which removes backlash within the joint between a wheel hub and a constant velocity universal joint, and increases the rigidity of the bearing device. There is provided a drive wheel bearing device in which a wheel hub and a double-row bearing are integrated into a single unit, and an outer joint member of a constant velocity universal joint is engaged inside the unit via a serrated section. In this structure, at least one of the inner races of the double-row bearing is formed on a separate inner ring engaged onto the wheel hub, irregularities are formed on the outer peripheral surface of the wheel hub, and radial expansion swaging of the wheel hub is used to cause the irregularities to bite into the inner peripheral surface of the inner ring, thereby fastening the wheel hub and the inner ring together through a plastic deformation section.