NOVELTY - A curable composition contains polymerizable compound having polymerizable double bond. The mass ratio of polymerizable compound (P) having molecular weight of 1000 or more with respect to total content of polymerizable compound in the curable composition is 90 mass% or more. The component (P) contains fluoropolymer (X) having repeating unit (a) derived from fluoro monomer and repeating unit (b) derived from fluorogen having unsaturated side chain, and fluoropolymer (X). The repeating unit (a) is chosen from fluoro monoene and cyclopolymerizable fluorogen.    USE - Curable composition is used for fluorine-containing cured material for optical medium and light-emitting element (all claimed). Used included but are not limited to optical waveguide, pellicle material, plasma display panel, liquid crystal display, field emission display, organic electroluminescent display, artificial lens, contact lens, low-refractive-index lens, light-emitting element, solar cell element, semiconductor element, light emitting diode and laser diode.    ADVANTAGE - The curable composition has high curing rate and excellent productivity, and provides fluorine-containing cured material having excellent light resistance, transparency, heat resistance, dimensional stability and productivity.    DETAILED DESCRIPTION - A curable composition contains polymerizable compound having polymerizable double bond. The mass ratio of polymerizable compound (P) having molecular weight of 1000 or more with respect to total content of polymerizable compound in the curable composition is 90 mass% or more. The component (P) contains fluoropolymer (X) having repeating unit (a) derived from fluoro monomer and repeating unit (b) derived from fluorogen having unsaturated side chain, and fluoropolymer (X). The repeating unit (a) is chosen from fluoro monoene and cyclopolymerizable fluorogen. The fluoropolymer (X) is a copolymer having molecular weight of 1000 or more. An INDEPENDENT CLAIM is included for manufacture of curable composition, which involves adding portion of fluoro monomer (a) and fluorogen (b) in reaction container, polymerizing and adding remaining amount of fluoro monomer (a) and fluorogen (b) during advancing of polymerization.