A bearing unit is provided, wherein the outer peripheral surface of the
inner race extends outward in the axial direction beyond the end surface
of the outer race, and is formed such that the diameter of the outer
peripheral surface of the inner race increases in the direction toward the
rolling elements, such that when lubrication oil is ejected together with
air on the outer peripheral surface of the inner race, the lubrication oil
moves over the outer peripheral surface due to centrifugal force and is
supplied to the rolling elements, making it possible to secure the amount
of lubrication oil supplied per unit time to the inside of the bearing,
and thus making it possible to reduce wind noise.
