The present invention provides a photocurable composition for nails or artificial nails that can form a cured product having excellent durability (maintenance of adhesion to nails). The present invention also provides a photocurable composition for nails or artificial nails that has a low odor, generates little heat during curing, and can form a cured product having excellent surface curability. Moreover, this invention provides the photocurable composition for nail claw or artificial nail which can form the hardened cured material excellent in the shear adhesive force. The nail or artificial nail photocurable composition according to the present invention includes the following components (A) to (D): (A) component: urethane-modified (meth) acryl oligomer (B) component: (meth) acrylamide Monomer (C) component: (meth) acrylic monomer having acid group (D) component: photoinitiator.本発明は、耐久性（爪に対する接着維持性）に優れた硬化物を形成できる爪または人工爪用光硬化性組成物を提供する。また、本発明は、低臭気であり、硬化時の発熱が少なく、かつ表面硬化性に優れた硬化物を形成できる、爪または人工爪用光硬化性組成物を提供する。また、本発明は、剪断接着力に優れた硬化物を形成できる爪または人工爪用光硬化性組成物を提供する。 本発明に係る爪または人工爪用光硬化性組成物は、下記の（Ａ）～（Ｄ）成分を含む：（Ａ）成分：ウレタン変性（メタ）アクリルオリゴマー（Ｂ）成分：（メタ）アクリルアミドモノマー（Ｃ）成分：酸性基を有する（メタ）アクリルモノマー（Ｄ）成分：光開始剤。
