An optical information recording medium includes a substrate having a
pregroove thereon, an optical recording layer containing a
light-absorbing substance composed of a dye absorbing a laser beam, and a
light-reflective layer reflecting the laser beam. The ratio of the
cross-sectional area of the optical recording layer (i.e., the dye) in
the pregroove to the cross-sectional area of the pregroove in the
direction of the diameter of the optical information recording medium is
about 30% to about 63%. In the optical information recording medium, the
phenomenon by which the recording power of the laser beam heats the dye
in the optical recording layer and the heat is diffused through the
optical recording layer and the light-reflective layer is considered.