| 摘要 |
An optical recording medium is provided which has a plurality of recording layers, in which a favorable recording mark can be formed and desired reproduction accuracy can be obtained in any of the recording layers. The optical recording medium has a first recording layer and a second recording layer. In the first and second layers, a recording mark, having an increased thickness larger than that of a neighboring space portion, is formed by an irradiation with a laser beam. The refractive index of the second recording layer placed relatively closer to an incident surface of a laser beam is lower than that of the first recording layer placed farther away from the incident surface of the laser beam than the second recording layer.
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