The coating composition of the present invention contains an organic-inorganic hybrid polymer and a polysiloxane having a specific molecular weight, wherein the organic-inorganic hybrid polymer is prepared from a specific silane compound and a specific silyl group-containing polymer, and the weight ratio (Wa/Wb) between the silane compound content (Wa) and the silyl group-containing polymer content (Wb) is within the range from 5/95 to 50/50 (provided that Wa+Wb=100). The coating composition enables to obtain a coating film excellent in transparency, adhesion to organic substrates and radical resistance, and the coating composition has excellent storage stability.