Patent ID: 8530140

Claim:
An optical information recording medium comprising at least a recording layer that allows information to be recorded thereon and/or reproduced therefrom by being irradiated with a laser beam, a metallic reflective layer, and a transmittance adjusting layer in this order from a laser beam incident side, wherein the transmittance adjusting layer contains Bi, Ti, O, and M, wherein M is at least one element selected from C, Si, Zr, Hf, Y, Cr, Zn, Ga, Co, In, Ta, Ag, Cu, Pd, Ge, Sb, and Te, and with a composition of Bi, Ti, O, and M contained in the transmittance adjusting layer being denoted as Bi a Ti b O c M d , in atomic number ratio, a, b, c, and d satisfying 0.252≦a≦0.35, 0.07≦b≦0.125, 0.61≦c≦0.65, 0<d≦0.05, and a+b+c+d=1, wherein the metallic reflective layer and the transmittance adjusting layer are in contact.