An optical information recording medium including a substrate, a recording
layer, and a cover layer in this order; wherein information is recorded or
reproduced by irradiating a laser beam having an wavelength in the range
of 380 to 500 nm on the recording layer through a lens having a numerical
aperture NA of 0.7 or more; the recording layer includes an organic
substance; and the extinction coefficient k of the recording layer is at
least 0.1 and less than 0.3.
