To obtain an optically three-dimensional shaping composition which excels in heat resistance, low water absorption properties, and dimension stability.

The optically three-dimensional shaping resin composition comprising a polymerizable component and a polymerization initiator uses a fumaric diester. Furthermore, the optically three-dimensional shaping composition comprises a fumaric diester (M1 component), a vinyl monomer (M2 component) containing two or more carbon-carbon double bonds in the molecule, and a polymerization initiator (L1 component).