At least a first recording layer (L0 layer) and a second recording layer (L1 layer) are provided. The first recording layer is disc-shaped, and has a first recording track path formed for recording recording information. The second recording layer is disc-shaped, arranged on the first recording layer and has a second recording track path formed in an opposite direction to the first recording track path for recording recording information. On edge parts on the outer circumference sides of the first recording layer and the second recording layer, first buffer areas (104-0 and 104-1) are further provided for preventing a recording or reproducing position from deviating from the first recording layer or the second recording layer and for interlayer jump. At least a part of the first buffer area is previously formed as a pre-recording area by an embossed pit (in the case of DVD-RW) or by a pit formed by recording laser irradiation (in the case of DVD-R).