The present invention relates to a bearing device for supporting a pinion
shaft so as to freely rotate with respect to a case. The bearing device
comprises a first tilt-contact rolling bearing provided on the
connecting-flange-side outer peripheral surface of the pinion shaft and a
second tilt-contact rolling bearing formed from an angular ball bearing
provided on the pinion-gear-side outer peripheral surface of the pinion
shaft, wherein lines of action of the first and second tilt-contact
rolling bearings intersect with one another on an outer diameter side,
the connecting-flange-side end portion of the first tilt-contact rolling
bearing and the pinion-gear-side end portion of the second tilt-contact
rolling bearing are respectively sealed with seal members, a sealed space
between the seal members is infilled with grease, and the connecting
flange is fastened in the pinion-gear direction to thereby preload the
first and second tilt-contact rolling bearings.