The first aspect of the invention provides a novel compound containing a reactive functional group represented by formula (1)R.sup.2 --O--CO--NH--CH.dbd.CH--R.sup.1 (1)wherein R.sup.1 represents a hydrogen atom, an aromatic hydrocarbon group, or a saturated or unsaturated aliphatic hydrocarbon group, R.sup.2 represents a formula comprising alicyclic functionality.The second aspect provides an active energy ray-curable unsaturated resin composition prepared by mixing a reaction product of the above-mentioned compound (1) with an unsaturated resin containing an acid group and with a diluent. The composition can be cured by active energy rays, and it can be used as an alkali developable and active energy ray-curable type resist resin composition.The third aspect provides an active energy ray-polymerizable unsaturated resin composition obtainable by allowing to react an unsaturated compound (E) containing an alicyclic epoxy group represented by formula (1) with a colloidal silica (F) in the presence of a metal chelate and/or metal alkoxide (G). A powder-state active energy ray-polymerizable unsaturated resin composition is obtained by removing a solvent from the composition.A fourth aspect of the invention provides a composition which comprises a copolymer of a specified polysiloxane-based macromonomer with a compound represented by formula (1), and an organic aluminum chelate compound, and the composition is curable at low-temperatures.