Patent ID: 8602655

Claim:
A bearing unit for a turbocharger supporting a rotary shaft having one end provided with a turbine wheel, the other end provided with an impeller, and a large-diameter turbine-side step formed on the turbine wheel side, the rotary shaft being supported between the turbine-side step and the impeller such that the rotary shaft is freely rotatable, the bearing unit comprises: a turbine-side ball bearing having an inner race adjacent to the turbine side-step and in which balls are located on the turbine-wheel side; an impeller-side ball bearing positioned such that balls are located on the impeller side; and a positioning portion configured to restrict movement of the inner race of the turbine-side ball bearing toward the turbine wheel side and to position the turbine-side ball bearing such that the turbine wheel side end of the inner race is separated from the turbine side step, wherein an impeller-side end of the inner race of the turbine-side ball bearing extends to a point close to the impeller, wherein movement of the impeller-side end of the inner race is restricted by the positioning portion.