Most at least the record film where information

摘要

PROBLEM TO BE SOLVED: To provide a phase change optical recording medium having a multilayered structure with a large capacity and an excellent erasing ratio. SOLUTION: In the optical recording medium having a plurality of information recording layers each having a recording film where information is recorded by the phase change between a crystalline state and an amorphous state by irradiation of light and protective films adjacent to the recording film, at least one information recording layer except for the information recording layer in the farthest position from the light incident side has a protective film made of a material containing Al, Si and N as the components.