Patent ID: 8865286

Claim:
An optical information recording medium comprising: a substrate; a plurality of information signal layers provided on the substrate, each information signal layer including an inorganic recording layer, a first protective layer provided on a first main surface of the respective inorganic recording layer, and a second protective layer provided on a second main surface of the respective inorganic recording layer; and a cover layer provided on the information signal layers, wherein a first one of the information signal layers is provided with an inorganic recording layer including Pd oxide, wherein any one surface of sides of the substrate and the cover layer is a light irradiation plane irradiated with light in order to record or reproduce information signals on the plurality of information signal layers, and wherein of the first protective layer and the second protective layer of the first information signal layer, only the protective layer which is opposite to the light irradiation plane out of the first protective layer and the second protective layer includes a compound oxide of Si oxide, In oxide and Zr oxide as a main component.