Provided is an optical glass having optical constants, a refractive index (nd) of more than 1.9 and an Abbe number (nud) of not more than 38, having a small partial dispersion ratio and capable of being produced from inexpensive materials. The optical glass has a partial dispersion ratio (thetag, F) of at most 0.615, and contains, as indispensable ingredients, B203, La2O3, TiO2, Nb2O5 and Ta2O5, wherein the ratio, as % by mass, of TiO2/Nb2O5 is at most 0.26 and GeO2/Nb2O5 is at most 0.38. The optical glass contains, in terms of % by mass, the following ingredients: B203 5 to 22%,La2O3 15 to 50%,TiO2 0.01 to 15%, Nb2O5 5 to 40%, and Ta2O5 0.1 to 25%, SiO2 0 to 10% and/or GeO2 0 to 10% and/or Al2O3 0 to 10% and/or Gd2O3 0 to 16% and/or ZrO2 0 to 15% and/or WO3 0 to 22% and/or Sb2O3 0 to 1%.