PROBLEM TO BE SOLVED: To provide a dental visible photopolymerizable composition having sufficient mechanical strength and a small shrinkage stress at the time of curing. (A) Bifunctional aromatic (meth) acrylic group-containing polymerizable property. A (meth) acrylic group-containing polymerizable monomer containing a monomer and / or a bifunctional aliphatic (meth) acrylic group-containing polymerizable monomer, (b) (b1) α-diketone compound and (b2). It functions as (c) a chain transfer agent and a radical generator together with a polymerization initiator selected from either a polymerization initiator composed of a combination with an amine compound or (b3) a single molecule cleavage type photopolymerization initiator. , A compound having a quinone structure other than the α-diketone compound such as a 4-naphthoquinone compound, and the total amount of the (c) and the (b1) or (b3) compounded with respect to 100 parts by mass of the (a) A dental visible photopolymerizable composition of 2 to 2.0 parts by mass. [Selection diagram] None【課題】 充分な機械的強度を有するとともに、硬化時の収縮応力が小さい歯科用可視光重合性組成物を提供する【解決手段】 （ａ）２官能芳香族系（メタ）アクリル基含有重合性単量体及び／又は２官能脂肪族系（メタ）アクリル基含有重合性単量体を含む（メタ）アクリル基含有重合性単量体、（ｂ）（ｂ１）α－ジケトン化合物と（ｂ２）アミン化合物との組み合わせからなる重合開始剤、又は（ｂ３）単分子開裂型光重合開始剤のいずれかから選択される重合開始剤とともに、（ｃ）連鎖移動剤及びラジカル発生剤として機能する、１，４－ナフトキノン化合物などのα－ジケトン化合物以外のキノン構造を有する化合物を含み、前記（ａ）１００質量部に対する前記（ｃ）と前記（ｂ１）又は（ｂ３）との総配合量が０．２～２．０質量部である歯科用可視光重合性組成物。【選択図】なし
