| 摘要 |
An eccentricity detecting method is a method of detecting an eccentricity between a first recording layer (L0 layer) and a second recording layer (L1 layer) of an information recording medium ( 100 ) provided with the first recording layer and the second recording layer, each of which is for recording record information, the eccentricity detecting method is provided with: a detecting process of detecting at least one of first position information indicating a position of each of at least two reference points (A, B, C, D) in one recording layer out of the first and second recording layers and second position information indicating a position of respective one of at least two target points (a, b, c, d), which corresponds to each of the at least two reference points respectively, in other recording layer out of the first and second recording layers; and a calculating process of calculating the eccentricity, on the basis of the at least one of the first and second position information detected.
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