The purpose of the present invention is to provide: an intestinal barrier function-enhancing composition capable of enhancing intestinal barrier function; and an agent for enhancing the intestinal barrier function of gallic acid. The present invention pertains to an intestinal barrier function-enhancing composition containing gallic acid as an active ingredient.本發明之目的為提供可改善腸道屏障功能之腸道屏障功能改善用組成物及沒食子酸之腸道屏障功能改善作用之增強劑。本發明係關於包含沒食子酸作為有效成分之腸道屏障功能改善用組成物。