To provide a method of forming a sharp edge of cutter that can improve the productivity and reduce the production cost by reducing the grinding amount in forming the sharp edge of a cutter.

At first, the side surfaces 6 of a point forming portion 7, which is a part of a cutter material 5, are ground to form ground point surfaces 9 continuously extending from a pointed end 8 toward the rear side thereof at a predetermined point angle α while leaving exposed the unground surfaces 10 of the material, which surfaces extend from the ground point surfaces 9 to the back portion 4 of the material. Thereafter, the ground point surfaces 9, boundary surfaces 11, and the unground material surfaces 10 are ground. Further, ground edge surfaces 15 extending from the pointed end 8 toward the rear side thereof at a predetermined edge angle β are formed by grinding. As a result, the grinding provides the cutter material with ground point surfaces 18 continuously extending from the ground edge surfaces 15 toward the rear sides thereof at a predetermined point angle α through ground boundary surfaces 17 and ground side surfaces 14 continuously extending from the ground point surfaces 18 toward the back sides thereof through ground boundary surfaces 13.