Patent ID: 8273438

Claim:
An information recording medium comprising N information layers, wherein N is an integer of 2 or larger, and the N information layers are disposed in the order of the Nth information layer, the (N−1)st information layer, the (N−2)nd information layer, . . . , the second information layer and the first information layer from the side where the laser beam is incident, and at least one of the second information layer to the Nth information layer comprises a recording layer capable of undergoing phase change, and the recording layer comprises a material that contains Sb and S and is represented by a formula (1) shown below: Sb x S 100-x (atomic %) (1) wherein suffix x represents the proportion in atomic % and satisfies a relationship of 50≦x≦98, wherein the recording layer has a thickness in a range of 2 nm to 9 nm, wherein the recording layer undergoes phase change when irradiated with a laser beam, and wherein the information layer that comprises the recording layer comprises at least a second dielectric layer, the recording layer, a first dielectric layer and a reflective layer disposed in this order from the side whereon the laser beam is incident.