An information recording medium 1 at least comprises a substrate 13 having
a microscopic pattern 20, which is constituted by a shape of continuous
substance of approximately parallel grooves formed with a groove section
G and a land section L alternately, a recording layer 12 formed on the
microscopic pattern 20 and a light transmission layer 11 formed on the
recording layer. The microscopic pattern 20 is formed so as to satisfy a
relation of P<.lamda.