Mit einem gehärteten Film beschichtete optisches Element

摘要

The invention provides a cured film-coated optical element having good scratch resistance, good moisture resistance and good weather resistance, of which the properties are degraded little even when it is further coated with a deposit film of an inorganic oxide. Provided is an optical element having, on an optical substrate, a cured film formed of a coating agent that contains (A) modified stannic oxide-zirconium oxide composite colloid particles as prepared by coating at least a part of the surfaces of stannic oxide-zirconium oxide composite colloid particles with stannic oxide-tungsten oxide-silicon oxide composite colloid particles, and (B) an organosilicon compound.