Optical recording medium and method for reproducing the same

An optical recording medium having a four 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, a third spacer layer, a fourth 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 (II) is satisfied:
• (R2×R3×R4×2)/R1≦0.0032 Equation (II),
• where R1 is a reflectivity of the first information layer, R2 is a reflectivity of the second information layer, R3 is a reflectivity of the third information layer, and R4 is a reflectivity of the fourth information layer, and
• the first spacer layer and the third spacer layer are equal to each other in thickness.

An optical recording medium having an n or more multi-layer structure (n is an integer equal to 5 or greater) which includes a substrate, a first information layer, a first spacer layer, a second information layer, an (n−1)th information layer, an (n−1)th spacer layer, an nth information layer, and a cover layer thinner than the substrate, with these layer being stacked in that order over the substrate, wherein

• the following Equation (III) is satisfied:
• (R2×Rn−1×Rn×2)/R1≦0.0032 Equation (III),
• where R1 is a reflectivity of the first information layer, R2 is a reflectivity of the second information layer, Rn−1 is a reflectivity of the (n−1)th information layer, and Rn is a reflectivity of the nth information layer, and
• the first spacer layer and the (n−1)th spacer layer are equal to each other in thickness.