Optical disc medium and optical disk reproducing apparatus and a recording apparatus

The optical disk medium of the present invention, the address information is recorded along the track groove 2 to meander. Track groove 2 is composed of a plurality of unit sections portions 22 and 23, the side surface of each unit section part 22, 23 are periodically displaced in the disk radial direction. This displacement oscillates at a single period in the track direction, the pattern of the displacement is different depending allocated to each unit section part 22, 23 'each bit of the address information (sub information) " .