To provide a conical bearing device capable of shortening a machining time for the improvement of productivity.

This conical bearing device is equipped with a shaft 20 fixed to a lower housing 70, a pair of cones 80 and 85 having a circular end of the first diameter on each one end and a circular end of the second diameter larger than the first diameter on the other end, as well as a tapered surface of the prescribed degree of inclination on the side, and a bushing 40 having a through- hole inside for passing the shaft 20 and conical grooves 80a and 80b on both ends of the through-hole in such a state as faced to each other for housing a pair of the cones 80 and 85, and rotating on the operation of a drive motor. In addition, the cones 80a and 80b as a pair are fixed to the shaft 20 so that the first diameter circular ends are faced to each other via a spacer 40.