Abstract: A cured product of a resinous composition for dental use is neither stained nor discolored while used in the mouth for long periods of time. In addition, the cured product of the composition is not discolored with hot water, and its impact strength is high. The composition is easy to handle, and its storage stability is good. The composition comprises (a) an impact-resistant resinous complex composed of a (meth)acrylic polymer and core-shell structured polymer particles having at least one hard polymer layer, at least one soft polymer layer and an outermost hard polymer layer, wherein the impact-resistant resinous complex contains ionic components in an amount not larger than 0.05% by weight of the resinous composition, (b) (meth)acrylate monomer, and (c) a polymerization initiator.