<p>To provide a throw away chip clamp mechanism capable of simply mounting a throw away chip and exhibiting an effect for preventing the dislocation thereof, there is provided a screw-hole-provided screw member 36 having a screw hole 36a at the head portion 36c thereof. The screw member 36 is threaded with the mounting screw hole 33 of a chip mounting seat 32 with the head portion 36c projecting from the chip mounting seat 32 and a throw away chip 37 is seated on the chip mounting seat 32 in the state that the engaging portion 37f thereof is engaged with the head portion 36c of the screw-hole-provided screw member 36. <IMAGE></p>
