A resin according to the present invention is prepared by reacting a reaction product, which is obtained by Michael addition reaction between the following component (A) and the following component (B) and a subsequent amide group formation reaction, with the following component (C): (A) an aliphatic diamine having 2 to 8 carbon atoms or a diamine having a C6-8 aromatic ring; (B) an unsaturated carboxylic acid represented by formula (2) and/or a derivative thereof, provided that the following component (C) is excluded: [in formula (2), R1 and R2 independently represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, an aralkyl group having 1 to 8 carbon atoms or an aryl group]; and (C) a (meth)acrylic acid-type compound having at least one glycidyl or isocyanate group.