Patent ID: 8800702

Claim:
An in-wheel motor drive assembly comprising: a motor unit including a motor rotary shaft and a motor-unit casing forming a contour of the motor unit; a speed reduction unit including an output shaft reducing the rotational speed of the motor rotary shaft and outputting the reduced rotation and a speed-reduction-unit casing forming a contour of the speed reduction unit, the speed reduction unit being disposed on one axial side of the motor unit; a wheel hub bearing unit including a wheel hub fixedly coupled with the output shaft and a wheel-hub-bearing outer ring rotatably supporting the wheel hub, the wheel hub bearing unit being disposed on one axial side of the speed reduction unit; a coupling member with a root end part secured to at least one of the wheel-hub-bearing outer ring and the speed-reduction-unit casing and with a tip end part projecting radially outward and having a coupling portion at a tip end region of the coupling member, wherein one of the wheel-hub-bearing outer ring and the speed-reduction-unit casing includes a casing projecting portion projecting toward the other, and the other engages with the casing projecting portion, and the coupling member is fixedly interposed between the wheel-hub-bearing outer ring and the speed-reduction-unit casing on a radially outside of the casing projecting portion.