A structure comprising: a plastic substrate and a composition that has been applied to the substrate, the composition comprising: a fluorine-containing polymer; a polyol compound having a hydroxyl value of 10 to 300 mgKOH/g; an organic solvent; and a curing agent, the polyol compound being contained in an amount of not less than 0.1 mass% but less than 100 mass% relative to the fluorine-containing polymer, wherein the fluorine-containing polymer is selected from the group consisting of copolymers mainly containing by mol chlorotrifluoroethylene of chlorotrifluoroethylene (CTFE)/hydroxybutyl vinyl ether/different monomer, and copolymers mainly containing by mol vinyl acetate of fluorine-containing monomer/vinyl acetate/hydroxy-containing monomer of formula /carboxy-containing monomer of formula, wherein the formula is CH 2 =CH-(CH 2) l -O-(CH 2) m -OH wherein 1 is 0 or 1, and m is an integer of 2 or greater, and the formula is R 1 R 2 C=CR 3 -(CH 2) n -COOH wherein R 1, R 2, and R 3 are the same as or different from each other, and are each a hydrogen atom, an alkyl group, a carboxy group, an acyloxy group, or an alkoxycarbonyl group; and n is an integer of 0 or greater, wherein the polyol compound has a number average molecular weight of 300 to 4000 determined by gel permeation chromatography, and wherein the polyol compound is at least one selected from the group consisting of polyester polyols, polycarbonate polyols, and polybutadiene polyols. a plastic substrate and a composition that has been applied to the substrate, the composition comprising: a fluorine-containing polymer; a polyol compound having a hydroxyl value of 10 to 300 mgKOH/g; an organic solvent; and a curing agent, the polyol compound being contained in an amount of not less than 0.1 mass% but less than 100 mass% relative to the fluorine-containing polymer, wherein the fluorine-containing polymer is selected from the group consisting of copolymers mainly containing by mol chlorotrifluoroethylene of chlorotrifluoroethylene (CTFE)/hydroxybutyl vinyl ether/different monomer, and copolymers mainly containing by mol vinyl acetate of fluorine-containing monomer/vinyl acetate/hydroxy-containing monomer of formula /carboxy-containing monomer of formula, wherein the formula is CH 2 =CH-(CH 2) l -O-(CH 2) m -OH wherein 1 is 0 or 1, and m is an integer of 2 or greater, and the formula is R 1 R 2 C=CR 3 -(CH 2) n -COOH wherein R 1, R 2, and R 3 are the same as or different from each other, and are each a hydrogen atom, an alkyl group, a carboxy group, an acyloxy group, or an alkoxycarbonyl group; and n is an integer of 0 or greater, wherein the polyol compound has a number average molecular weight of 300 to 4000 determined by gel permeation chromatography, and wherein the polyol compound is at least one selected from the group consisting of polyester polyols, polycarbonate polyols, and polybutadiene polyols. a fluorine-containing polymer; a polyol compound having a hydroxyl value of 10 to 300 mgKOH/g; an organic solvent; and a curing agent, the polyol compound being contained in an amount of not less than 0.1 mass% but less than 100 mass% relative to the fluorine-containing polymer, wherein the fluorine-containing polymer is selected from the group consisting of copolymers mainly containing by mol chlorotrifluoroethylene of chlorotrifluoroethylene (CTFE)/hydroxybutyl vinyl ether/different monomer, and copolymers mainly containing by mol vinyl acetate of fluorine-containing monomer/vinyl acetate/hydroxy-containing monomer of formula /carboxy-containing monomer of formula, wherein the formula is CH 2 =CH-(CH 2) l -O-(CH 2) m -OH wherein 1 is 0 or 1, and m is an integer of 2 or greater, and the formula is R 1 R 2 C=CR 3 -(CH 2) n -COOH wherein R 1, R 2, and R 3 are the same as or different from each other, and are each a hydrogen atom, an alkyl group, a carboxy group, an acyloxy group, or an alkoxycarbonyl group; and n is an integer of 0 or greater, wherein the polyol compound has a number average molecular weight of 300 to 4000 determined by gel permeation chromatography, and wherein the polyol compound is at least one selected from the group consisting of polyester polyols, polycarbonate polyols, and polybutadiene polyols.