PURPOSE: To increase the contact pressure between abrasive and a workpiece to be polished so as to enhance the polishing efficiency and to enhance the discharge ability of chips and the lubricity at a surface to be polished in order to reduce the polishing resistance during polishing of a lens.

CONSTITUTION: There are provided a grindstone base body 1 having a curved surface 1A corresponding to the shape of an optical lens article and an abrasive layer 6 formed over the curved surface 1A. Several convexities having a uniform degree of projection and made of at least graphite are formed on the curved surface 1A, and the abrasive layer 6 is formed by fixing ultra-abrasive grain having an averaged particle size of 3 to 30μm, onto the curved surface formed thereon with the convexities in a metal plating phase.