Patent ID: 7464390

Claim:
An optical information recording medium comprising: a substrate, a resin intermediate layer, and a pair of recording layer structures, wherein the pair of recording layer structures is formed on the substrate so as to sandwich the resin intermediate layer, the optical information recording medium is recordable or rewritable optical information recording medium and is a two-layered optical information recording medium to which a recording beam and a reproducing beam are irradiated to the pair of recording layer structures from one direction, and the pair of recording layer structures of the optical information recording medium individually has a different track pitch, the ratio of difference in the track pitch between the pair of recording layer structures defined by the following Expression 1 is +0.03 to +0.15: (T2−T1)/T1 Expression 1 where T 1 represents a track pitch of the recording layer structure disposed on the laser beam irradiation side, and T 2 represents a track pitch of the recording layer structure disposed on the inner side viewed from the laser beam irradiation side.