A photocurable composition includes a monomer component including a monomer (X) which has two aromatic rings and two (meth)acryloyloxy groups in a molecule, and which has a Mw of from 400 to 580, and a monomer (H) which has at least one of a hydroxyl group or a carboxy group and has a (meth)acryloyloxy group in a molecule, and which has a Mw of from 100 to 700, and a photopolymerization initiator, and a functional group value (a) thereof defined by the following formula is from 0.50 × 10-3mol/g to 2.00 × 10-3mol/g. functional group value (a) = (nH/MH) × PHnHrepresents a total number of hydroxyl groups and carboxy groups included in a molecule of the monomer (H), MHrepresents the Mw of the monomer (H), and PHrepresents a mass ratio of the monomer (H) to a total of a (meth)acryl monomer component.一種光硬化性組成物，含有單體成分及光聚合起始劑；該單體成分包含1分子中具有2個芳香環與2個(甲基)丙烯醯氧基且Mw為400~580之單體(X)、及1分子中具有羥基及羧基中之至少一者與(甲基)丙烯醯氧基且Mw為100~700之單體(H)；且官能基價(a)為0.5×10-3~2.0×10-3mol/g。 官能基價(a)=(nH/MH)×PHnH表示(甲基)丙烯酸單體(H)1分子中含有之羥基及羧基之總數，MH表示(甲基)丙烯酸單體(H)之Mw，PH表示(甲基)丙烯酸單體(H)相對於(甲基)丙烯酸單體成分全體之質量比。
