Patent ID: 7416786

Claim:
An amorphous carbon film, comprising: an amorphous carbon layer; and an interlayer disposed between a base material and the amorphous carbon layer, said interlayer containing at least one substance selected from the group consisting of B, Al, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, and W, and said interlayer having a thickness of 0.5 nm or greater 10 nm or less; wherein on a base material side of said interlayer, there is a mixed layer which contains portions of the base material and the interlayer material and which has a thickness of 0.5 nm or greater and 10 nm or less, wherein an average oxygen concentration contained in said mixed layer or in said mixed layer and intertayer is 1 at % or less, wherein a concentration of carbon in the amorphous carbon layer is 99.5 at % or greater, a concentration of hydrogen in the amorphous carbon layer is 0.5 at % or less, a concentration of a rare gas element in the amorphous carbon layer is 0.5 at % or less, and wherein the amorphous carbon film is formed by: executing a cathode arc ion plating method, with solid carbon as raw material and under an atmosphere with a degree of vacuum of 0.05 Pa or lower.