Provided is a chemically strengthened optical glass with improved crack resistance and high hardness, in which the refractive index and the Abbe number required for a conventional optical glass are maintained.
The chemically strengthened optical glass includes a compressive stress layer on a surface, and contains, by mass % in terms of oxide: 2.0 to 20.0% of a SiO2 component, 5.0 to 35.0% of a B2O3 component, 20.0 to 60.0% of a La2O3 component, 2.0 to 25.0% of a TiO2 component, 2.0 to 15.0% of a Nb2O5 component, and more than 0% to 10.0% of a LiO2 component, and the chemically strengthened optical glass is characterized in that an Hv change rate defined as [(Hvafter−Hvbefore)/Hvbefore]×100 is equal to or greater than 3.0%.