Patent ID: 8900336

Claim:
A cutting tool comprising: a cutting tool substrate provided with a rake face and a flank face; and a coating layer that is formed on a surface of the rake face and the flank face; wherein the coating layer is represented by Ti 1-a-b-c Al a W b M c (C 1-x N x ), M being selected as at least one from the group consisting of Si, Y, Group-IV, V, and VI metals, excluding Ti and W, in the periodic table; wherein the content correlations measured in a molar fraction are 0.3≦a≦0.6; 0.01≦b≦0.2; 0≦c≦0.2; and 0≦x≦1, and a content of W in the coating layer at the flank face is higher than the content of W at the rake face; and the coating layer comprises droplets thereon, and the content of W in the droplets at the flank face is lower than the content of W in the droplets at the rake face.