The present invention relates to an optical information recording medium including
a disk-shaped transparent substrate and a recording layer for recording, reproducing
or erasing information by irradiation of laser light, the recording layer being
formed over the substrate. The recording layer of the present invention includes
information tracks including groove tracks and land tracks that are formed alternately
in a radial direction of the disk. The information tracks comprise information
recording regions and address regions interposed between the information recording
regions, the information recording regions and the address regions being arranged
along the tracking direction of the laser light. In the information recording regions,
every second step in the radial direction of steps for dividing the groove tracks
from the land tracks adjacent to the groove tracks is wobbled in the tracking direction,
and in a range whose ends are defined by the address regions the every second step
is wobbled at a constant frequency. Prepit addresses for providing information
on a position on the recording medium are formed on the address regions. Moreover,
the present invention provides an optical information recording medium including
n recording layers (where n is an integer of at least 2), and in at least the first
recording layer to the (n-;1)th recording layer from the transparent substrate
side, no pair of adjacent address regions in the radial direction of the disk are
arranged so as to be aligned on a straight line passing through the center of the disk.
