A turbocharger for an internal combustion engine, in which a bearing having
excellent abrasion resistance without generating a black corrosion product
in a high-temperature oil environment is provided. As bearing materials of
a turbocharger, a copper alloy material containing, as main components,
Cu, Zn, Al, Mn, and Si is employed. The elongating direction of an Mn--Si
compound crystallized in the alloy material is set to the axial direction
of a rotary shaft with respect to a radial bearing and is set to the
direction perpendicular to the rotary shaft with respect to a thrust
bearing.
