An optical information recording medium in which the ranges of the refractive
index and thickness of a protective layer in a case where the protective layer
is constituted by a plurality of layers are newly specified and the refractive
index and thickness of the protective layer are determine in these ranges, thereby
ensuring that even if variation in thickness of the protective layer to 3
m is tolerated, spherical aberration in the optical information recording
medium is substantially to within 30 mrms.