A rolling bearing has the radius of curvature of the raceway on an inner ring
and
an outer ring is from not smaller than 50.1% to not greater than 51.9% of the diameter
of the balls, and at least one of the compositions of the bearing is obtained by
forming an alloy steel having a carbon (C) content of from not smaller than 0.50%
to not greater than 0.90%, a chromium (Cr) content of from not smaller than 3.0%
to not greater than 15.0%, a manganese (Mn) content of from not smaller than 0.10%
to not greater than 2.0%, a silicon (Si) content of from not smaller than 0.10%
to not greater than 2.0%, a molybdenum (Mo) content of zero or not greater than
2.0% by weight, and a vanadium (V) content of zero or not greater than 2.0%, by weight.
