An active energy ray-curing resin composition comprises (i) a heat-crosslinkable linear copolymer comprising 5 to 30 mol % of a monomer represented by the general formula I shown below and 5 to 50 mol % of a monomer represented by the general formula II shown below as the copolymer constituents: ##STR1## (wherein R.sup.1 is hydrogen or alkyl or hydroxyalkyl group having 1 to 3 carbon atoms; R.sup.2 is hydrogen or alkyl or acyl group having 1 to 4 carbon atoms which may have a hydroxyl group; R.sup.3 is hydrogen or alkyl group having 1 to 3 carbon atoms; R.sup.4 is a divalent hydrocarbon group which may have internally an ether bond and may also be substituted with halogen atoms; and R.sup.5 is alkyl having 3 to 12 carbon atoms or phenylalkyl group or phenyl group), and (ii) a monomer having an ethylenically unsaturated bond.