To provide a sensor equipped and in-wheel motor incorporated bearing device for a vehicle wheel, which is capable of accurately detecting a rotating condition of a vehicle drive wheel and is effective to accurately control an electric drive motor or an automotive vehicle, the sensor equipped and in-wheel motor incorporated bearing device includes a wheel support bearing assembly for rotatably supporting a hub of the vehicle drive wheel, an electric drive motor providing a rotation device source for the vehicle drive wheel, and a speed reducing mechanism interposed between the electric drive motor and the wheel support bearing assembly. A rotation detecting device is also provided for detecting the rotation of an output shaft of the speed reducing mechanism.