To provide an information recording medium free of groove deforma tion in the recording and reproduction of a signal and disk vibration and warpage in the read of a signal and excellent also in the transferability of pits and grooves.

The information recording medium uses a substrate obtained by molding an alicyclic structure-containing polymer having 145-170°C glass transition temperature (Tg) and 1-50 g/10 min melt flow rate(MFR) measured according to JIS K-7210 under the conditions of 2.16 kg load and 280°C. The substrate has ≥26,000 kgf/cm2 flexural elastic modulus and ≤10 nm surface roughness (Rmax) of the specular part.