Bearing steel and manufacturing method thereof, and a bearing component and a manufacturing method thereof that has excellent manufacturability and corrosion resistance

By mass%, C: 0.3~0.6%, Si: 0.1~2.0%, Mn: 0.1~0.5%, Cr: it contains 3.0 to 8.0% , Mo: 0.5% or less, N: limited to 0.02% or less (including 0%), and excellent in productivity and corrosion resistance, characterized by containing S satisfying the following formula (1) bearing steel was. Cr-300 × S ≧ 2.0 ··· (1)