Patent ID: 7264883

Claim:
A hard coating film excellent in adhesion to be formed on a substrate, comprising stacked layers including at least the following layers (1) to (3): (1) a first layer on the substrate side comprising one or more metals selected from the group consisting of elements in Groups 4A, 5A, and 6A of the periodic table; (2) a B- and C-containing surface layer; and (3) a graded composition layer that is formed in a sandwiched manner between the first layer and the surface layer, and has a thickness of 0.05 μm or more, and in which the content of B and C changes continuously or stepwise from the first layer side toward the surface layer side, wherein a bond between one or more elements selected from the group consisting of elements in Groups 4A, 5A, and 6A of the periodic table, and at least any of B, C, and N is contained in the graded composition layer.