For stereolithography polymerizable composition

In stereolithography by layered manufacturing method, the molding apparatus can be easily cleaned with water, shaped object to can easily be detached from the support, as can be readily cured by irradiation of 400nm or more beams, and to provide a versatile polymerizable composition. Equation (1) water-soluble radical-polymerizable compound represented by formula (A), a photopolymerization initiator generating a radical by irradiation of light wavelength of 400nm or more (B), and ionic surfactant (C ) containing photopolymerizable composition for optical molding. In formula (1), R Further,