Provided is a chemically strengthened optical glass with improved crack resistance and high hardness, in which the refractive index, the Abbe number, and the transmittance 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: 20.0% to 50.0% of a SiO2 component, 10.0% to 45.0% of a TiO2 component, and 0.1 to 20.0% of a Na2O 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%.