To provide a curable composition for inorganic mirror-surfaced substrates, improved in adhesion to a mirror-surfaced inorganic material while maintaining its weatherability and solvent resistance and weak solvent-modified with slight odor_( using a 3rd kind of organic solvent ).

The curable composition for inorganic mirror-surfaced substrates comprises (A) a copolymer with the main chain consisting substantially of a vinyl polymer, having in the molecule at least one silicon group bound to a hydrolyzable group, (B) a curing catalyst, (C) a silane coupling agent and (D) an organic solvent. This composition enables an inorganic mirror-surfaced substrate to be coated with a clear coating, to be prevented from staining or corrosion, and to be manifested with further feeling of depth. In addition, this composition is reduced in odor as a current environmental problem.