Disclosed herein is a resin composition for fixing a plate-shaped workpiece. The resin composition includes a composition and a photopolymerization initiator added to the composition. This composition is composed of (meth)acrylate and a plasticizer or a reactive diluent. Preferably, the composition constituting the resin composition contains 30% to 45% by mass of (meth)acrylate having an urethane bond, 5% to 15% by mass of (meth)acrylate not having an urethane bond, and 40% to 65% by mass of plasticizer, which is an ester.