To provide a radical-polymerizable resin composition which has low viscosity, little odor, and low irritativeness to the skin, and gives a cured material having good surface hardness, excellent toughness and a low degree of shrinkage, and excellent in adherence.

The radical-polymerizable resin composition contains at least one (meth)acrylate oligomer (A) selected from the group consisting of vinyl ester oligomers, urethane (meth)acrylate oligomers and polyester (meth)acrylate oligomers, and an oligomer (B) having one or more maleic acid ester and/or fumaric acid ester units, and a polymerizable monomer (C), wherein the molar ratio of the (meth)acrylate groups to the maleic acid ester and/or fumaric acid ester units is (1:0.1) to (1:2).