Abstract: [Problems] An object of the present invention is to provide a polyester resin having excellent curability and further having processability, retort resistance, and dent resistance, and a coating composition in which the polyester resin is used. [Solution] A polyester resin comprising a polyvalent carboxylic acid component and a polyhydric alcohol component as copolymerization components, wherein the polyester resin satisfies the following requirements (i) to (iii), (i) the polyvalent carboxylic acid component constituting the polyester resin has 10 mol % or more of a polyvalent carboxylic acid component having a furan skeleton, (ii) the number of kinds of polyhydric alcohol components constituting the polyester resin is two or more, and (iii) the polyester resin has an acid value of 70 eq/t or more and 400 eq/t or less.

Abstract: An object of the present invention is to provide an adhesive composition and a coating composition that have storage stability, high adhesiveness, and excellent blocking resistance and water resistance. The present invention provides a crystalline polyester resin comprising: a polyvalent carboxylic acid component and polyhydric alcohol component as a copolymerization components, wherein, 30 to 70 mol % of terephthalic acid, 10 to 60 mol % of 1,4-cyclohexanedicarboxylic acid, 5 to 30 mol % of aliphatic dicarboxylic acid having 10 or smaller of carbon atoms, and less than 3 mol % of an aromatic dicarboxylic acid component having a sulfonate group are contained as the polyvalent carboxylic acid component; and 50 to 100 mol % of 1,4-butanediol is contained as the polyhydric alcohol; wherein, an acid value of the crystalline polyester resin is 100 to 600 eq/t; a glass transition temperature of the crystalline polyester resin is ?30 to 30° C.; a melting point of the crystalline polyester resin is 70 to 160° C.