To provide a wheel supporting device which houses the housing of a motor on a more internal side of a wheel.

This wheel supporting device includes a constant velocity joint 30, an outer race 406 of bearings 11 and 12, and an annular boot 400. The constant velocity joint 30 is connected with the shaft 110 of an in-wheel motor 70, and transmits power which is generated by the in-wheel motor 70 to a wheel disk 10. The outer race 406 of the bearings 11 and 12 rotatably supports the constant velocity joint 30 and the wheel disk 10. The annular boot 400 is fixed to the periphery of one end of the case of the in-wheel motor 70, and is provided in a manner to cover a section from the case to the outer race 406.