An optical glass whose refractive index is high and whose coloring is decreased
comprising, by weight %, 2 to 45% of B2O3, 0 to 30% of SiO2
provided that the content of B2O3the content of SiO2,
10 to 50% of La2O3, 0 to 30% of TiO2, 0 to 15%
of ZnO, 0 to 15% of ZrO2, 0 to 35% of Nb2O5, 0
to 35% of BaO, 0 to 5% of SrO, 0% or more but less than 8% of CaO, 0% or more but
less than 13% of MgO, provided that the total content of BaO, SrO, CaO and MgO
is 0 to 40%, 0 to 20% of Gd2O3, 0 to 15% of Y2O3,
0 to 18% of Ta2O5, 0% or more but less than 0.5% of WO3,
0% or more but less than 1.5% of a total of Na2O, K2O and
Li2O, 0 to 10% of GeO2, 0 to 20% of Bi2O3,
0 to 10% of Yb2O3, 0 to 10% of Al2O3,
0% or more but less than 2% of Sb2O3 and 0 to 1% of SnO2.
