Areas, which are located on the inner peripheral sides of multi-layered information recording areas (20) and have the same radial ranges, are set as burst cutting area forming zones, and a burst cutting area (BCA) (101) is formed in one information recording layer. All of the same radial ranges of the other information recording layers are formed as mirror surfaces (5). Thereby, interference from other layers and scattering of readout light are prevented, so reading of the burst cutting area (BCA) is realized stably.