| abstract |
The hard coating layer includes at least a complex nitride or carbonitride layer ( 2 ) expressed by a composition formula: (Ti 1-x-y Al x Me y )(C z N 1-z ), Me being an element selected from Si, Zr, B, V, and Cr. The average content ratio X, the average content ratio Y, and the average content ratio Z satisfy 0.60≦x avg , 0.005≦y avg ≦0.10, 0≦z avg ≦0.005, and 0.605≦x avg +y avg ≦0.95. There are crystal grains having a cubic structure in the crystal grains constituting the complex nitride or carbonitride layer ( 2 ). A predetermined periodic content ratio change of Ti, Al and Me exists in the crystal grains having the cubic structure. |