NOVELTY - Curable fluorine-containing resin is obtained by reacting a polymer (P) and a compound (C). The polymer (P) is obtained by co-polymerizing compound (A) having polyperfluoroalkylene ethyl chain and styryl base on both ends and polymerizable unsaturated monomer (B) having at least one functional group (b) chosen from hydroxyl group, isocyanate group, epoxy group, carboxyl group, acid anhydride group and carboxylic acid halide group.    USE - The fluorine-containing resin composition is useful for producing hardened material and cured coating film for producing product (all claimed) e.g. scanner, camera, video camera, spectacles, timepieces, wristwatch, solar cells, film decorative board, furniture, synthetic leather, household appliance, LCD, and organic electroluminescent display (PDP).    ADVANTAGE - The fluorine-containing resin composition has excellent stability, leveling property, wettability, permeability, blocking prevention property, lubricating property, water-oil repellency, chemical-resistance, ink repellency, and antifouling property.    DETAILED DESCRIPTION - Curable fluorine-containing resin is obtained by reacting a polymer (P) and a compound (C). The polymer (P) is obtained by co-polymerizing compound (A) having polyperfluoroalkylene ethyl chain and styryl base on both ends and polymerizable unsaturated monomer (B) having at least one functional group (b) chosen from hydroxyl group, isocyanate group, epoxy group, carboxyl group, acid anhydride group and carboxylic acid halide group. The compound (C) is reacts to the functional group (b), and has a polymerizable unsaturated group and at least one functional group (c) chosen from hydroxyl group, isocyanate group, epoxy group, carboxyl group, acid anhydride group and carboxylic acid halide group. INDEPENDENT CLAIMS are included for the following:    (1) active energy ray-curable composition comprising the above-mentioned fluorine-containing curable resin, and active energy ray-curable resin or active energy ray-curable monomer;    (2) hardened material obtained by coating the fluorine containing curable resin composition or active energy ray-curable composition on a base material, and irradiating the base material by active energy ray to harden the base material; and    (3) product comprising cured coating film of fluorine containing curable resin composition or active energy ray-curable composition.