PROBLEM TO BE SOLVED: To provide a photocurable artificial nail composition that, when cured with an ultraviolet irradiation machine such as an LED light source, has excellent photocurability, while showing a type D durometer hardness of D30 or more, but keeping the highest exothermic temperature at the time of curing in a range of less than 55°C.SOLUTION: A photocurable artificial nail composition has a urethane (meth) acrylate resin (A) having a polytetramethylene glycol skeleton with the number of functional groups being 2-5, a (meth) acrylate monomer (B), and a photopolymerization initiator (C), with the weight ratio of the (A) and (B) being (A):(B)=95/5-25/75.SELECTED DRAWING: NoneCOPYRIGHT: (C)2020,JPO&INPIT【課題】ＬＥＤ光源等の紫外線照射機で硬化させた場合、良好な光硬化性を有しつつ、タイプＤデュロメーター硬度がＤ３０以上でありながら、硬化時の最高発熱温度が５５℃未満である光硬化性人工爪組成物を提供する。【解決手段】ポリテトラメチレングリコール骨格を有し官能基数が２～５のウレタン（メタ）アクリレート樹脂（Ａ）と、（メタ）アクリレートモノマー（Ｂ）と、光重合開始剤（Ｃ）とを含み、前記（Ａ）と（Ｂ）の重量配合比率が（Ａ）：（Ｂ）＝９５／５～２５／７５であることを特徴とする光硬化性人工爪組成物。【選択図】なし
