To provide a photocurable dental composite repairing material which is stable against indoor illumination light by a fluorescent lamp or against environmental light such as a dental light for illuminating inside the oral cavity to assure excellent operability while rapidly cured by intense photoirradiation by a photoirradiator for polymerization to give a cured product having excellent physical properties, and exhibits excellent preservation stability.

A photopolymerization initiator, which comprises (A) an α-diketone compound such as camphorquinone, (B) an aromatic tertiary amine compound such as ethyl p-dimethylaminobenzoate or N,N-dimethyl-p-toluidine, (C) a trihalomethyl group-substituted triazine compound such as 2,4,6-tris(trichloromethyl)-s-triazine or 2-phenyl-4,6-bis(trichloromethyl)-s-triazine, and (D) an aryl borate compound such as tetraphenylborate tri(hydroxyethyl)ammonium salt, is employed.

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