an optical disc is disclosed , having tracks formed in a spiral shape or a concentric circle shape , each of the tracks being radially divided into a plurality of zones , data being recorded and / or reproduced at different angular velocities in the individual zones in such a manner that the angular velocity in the same zone is the same , wherein a buffer area is formed at a zone boundary , and wherein at least one pit portion is formed in the buffer area so that the pit portion is almost radially adjacent to a pit portion of a zone on the inner periphery side and a pit portion of a zone on the outer periphery side .