Optical glass

A process for producing an optical element, which comprises producing an optical element blank and grinding and polishing said optical element blank, said optical element blank being formed of an optical glass comprising, by mass %,

• 5 to 32% of total of SiO2 and B2O3,
• 30 to 60% of La2O3,
• 51 to 65% of total of La2O3, Gd2O3 and Y2O3,
• 0.5 to 10% of ZnO,
• 1 to 20% of total of TiO2 and Nb2O5,
• 0 to 15% of ZrO2,
• 0 to 2% of WO3,
• 0 to 20% of Yb2O3,
• 0 to 10% of total of Li2O, Na2O and K2O,
• 0 to 10% of total of MgO, CaO, SrO and BaO,
• 0 to 12% of Ta2O5,
• 0 to 5% of GeO2,
• 0 to 10% of Bi2O3, and
• 0 to 10% of Al2O3,
• wherein the mass ratio of the content of SiO2 to the content of B2O3, (SiO2/B2O3), is from 0.3 to 1.0, and the mass ratio of the total content of Gd2O3 and Y2O3 to the total content of La2O3, Gd2O3 and Y2O3, (Gd2O3+Y2O3)/(La2O3+Gd2O3+Y2O3), is from 0.05 to 35/65,
• the optical glass having a refractive index nd of 1.90 to 2.0 and an Abbe's number νd of 32 to 38 and having a coloring degree λ70 of 430 nm or less.