To obtain a composition that forms an organic-inorganic hybrid having improved transparency and excellent heat resistance and has excellent coating suitability.

The resin composition comprises a resin having a hyper-branched structure and a hydrolyzable alkoxysilane. Especially the resin composition has a hyper-branched structure composed of a polycondensate of an ABx type molecule (A and B are each an organic group containing a mutually different functional group (a) or group b, respectively; the functional group (a) and the functional group b mutually and chemically cause a condensation reaction or addition reaction; X is an integer of ≥2).