To provide a polishing technique capable of improving shape precision of a workpiece.

The polishing method makes a processing work portion 5a relatively scan on a meridian line 18b of an autorotating workpiece 18 with a symmetrical shape with respect to rotational axis while autorotating a spherical polisher 5. Polishing is performed while an angle θ of a normal line 18d in a processing point 18c of the workpiece 18 to a rotational axis 5b of the polisher 5 within a plane orthogonal to a scanning direction of the polisher 5 is gradually reduced from an outer-periphery portion of the workpiece 18 toward the center, thereby attaining polishing by uniform removal amount in the center of the workpiece 18 and at a vicinity portion without changing relative scan speed on the meridian line 18b.