Patent ID: 8238214

Claim:
An optical recording medium having a three or more multi-layer structure which includes a substrate, a first information layer, a first spacer layer, a second information layer, a second spacer layer, a third information layer, and a cover layer thinner than the substrate, with these layers being stacked in that order over the substrate, wherein the following Equation (I) is satisfied: ( R 2 ×R 3 ×R 2 )/ R 1 ≦0.0032 Equation (I), where R 1 is a reflectivity of the first information layer, R 2 is a reflectivity of the second information layer, and R 3 is a reflectivity of the third information layer, R 1 , R 2 and R 3 are values of reflectivity detected by a photodetector, the first spacer layer and the second spacer layer are equal to each other in thickness, and R 2 is smaller than R 3 .