An optical information medium includes a disk-shaped substrate (100) having
a center hole (101), an annular information recording area thereon, and
an annular resin-based light-transmitting layer (102) thereon by which recording/reading
laser beam is transmitted to the information recording area. The light-transmitting
layer (102) terminates at a radially inner periphery which forms an annular
raised rim (6). The rim is effective for protecting the light-transmitting
layer from damages and dust adhesion, and when a plurality of such media are stacked,
preventing the media from intimate contact.
