aliphatic hydrocarbon group of 9 or less carbon atoms, an adhesive resin having an excellent balance between flowability and adhesion properties can be obtained. [1406] If X is a hydroxyl group and R3 in the formula (3) is a straight-chain or branched aliphatic hydrocarbon group of 11 or more carbon atoms, an adhesive resin having particularly excellent adhesion properties can be obtained. [1407]