The present invention is capable of forming a low viscosity, easy to be molded, excellent in toughness and water resistance, and, in particular, provides a resin composition for optical molding in a dental mouthpiece and a denture base material.The present invention relates toUrethane (meta) acrylic compound (a),Contains a photopolymerization initiator (b) andThe urethane (meta) acrylic compound (a) isWithin a moleculeA polyester having a structure derived from an aliphatic linear diol unit (a) having a branched structure of 4 to 18 carbon atomsPolycarbonatePolyurethaneAt least one polyol portion selected from the group consisting of polyether and polyetherUrethane bond(meta) acrylate containingThis invention relates to a resin composition for optical molding.
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