Patent ID: 8087852

Claim:
A diamond cutting member formed by a raw material made of a single crystal synthetic diamond having a hexahedral shape which basically has six surfaces and is formed with a cutting edge and a raked face, the diamond cutting member being integrally mounted on a given holder for use in performing cutting work, wherein the holder has an inclined surface inclined at a given inclined angle α with respect to a mount reference surface; the synthetic diamond is integrally mounted on the holder in an attitude such that a first side face forming one of the six surfaces of the synthetic diamond is located on the inclined surface in tight contact therewith, four ridgelines surrounding the first side face are inclined at a given angle ranging from 40° to 50° with respect to the inclined surface, and a first apex of one of eight apexes of the hexahedral shape is protruded from the mount reference surface along the inclining direction; and the first apex of the synthetic diamond has a portion formed with the raked face inclined from the surface to a surface at a given inclined angle θ ranging from 35°16′-5° to 35°16′+5°, in an orientation toward the first apex along the inclining direction of the inclined surface, the distal end being formed with the cutting edge extending along an inclining direction of the raked face.