Patent ID: 7648781

Claim:
A hard film comprising a total of two or more layers of a first unit layer and a second unit layer arranged alternately, the first unit layer comprising at least one of a hard film A1 and a hard film A2; and the second unit layer comprising at least one selected from the group consisting of a hard film B1, a hard film B2, and a hard film B3, wherein the first unit layer has a thickness of 200 nm or less, and the second unit layer has a thickness of 200 nm or less, wherein the multilayer hard film as a whole has an average composition comprising (Zr 1-a , Hf a )(C 1-x N x ) and satisfying following Conditions (1) and (2): 0.07≦a≦0.4 Condition (1) 0≦x≦1 Condition (2) wherein “a” and “x” are the atomic ratios of hafnium (Hf) and nitrogen (N), respectively, and wherein x is not equal to 1, wherein the hard film A1 is a hard film comprising (Zr 1-a , Hf a )(C 1-x N x ) and satisfying following Conditions (1D) to (3D): 0≦1 −a Condition (1D) 0≦a≦0.4 Condition (2D) 0≦x≦1 Condition (3D) wherein “a” and “x” are the atomic ratios of hafnium (Hf) and nitrogen (N), respectively, wherein the hard film A2 is a hard film comprising (Zr 1-a-c , Hf a , D c )(C 1-x N x ) and satisfying following Conditions (1B) to (3B): 0.05≦a≦0.4 Condition (1B) 0.03≦c≦0.3 Condition (2B) 0≦x≦1 Condition (3B) wherein D is at least one of silicon (Si) and boron (B); and “a”, “c”, and “x” are the atomic ratios of Hf, D, and N, respectively, wherein the hard film B1 is a hard film comprising M(C 1-x N x ) and satisfying following Condition (1E): 0≦x≦1 Condition (1E) wherein M is at least one of tungsten (W) and molybdenum (Mo); and “x” is the atomic ratio of nitrogen (N), wherein the hard film B2 is a hard film comprising Si 1-y-x C y N x and satisfying following Conditions (1F) to (3F): 0≦y≦0.25 Condition (1F) 0≦x≦1 Condition (2F) 0.5≦(1 −y−x )/x≦1.4 Condition (3F) wherein “y” and “x” are the atomic ratios of carbon (C) and nitrogen (N), respectively, and wherein the hard film B3 is a hard film comprising B 1-y-x C y N x and satisfying following Conditions (1G) to (3G): 0≦y≦0.25 Condition (1G) 0≦x≦1 Condition (2G) 0.5≦(1 −y−x )/x≦1.5 Condition (3G) wherein “y” and “x” are the atomic ratios of carbon (C) and nitrogen (N), respectively.