Object of the present invention is to search a novel pharmaceutical use of 5-[4-(6-methoxy-1-methyl-1H-benzimidazol-2-ylmethoxy) benzyl] thiazolidine-2, 4-dione being a condensed heterocyclic compound, or a salt thereof. 5-[4-(6-methoxy-1-methyl-1H-benzimidazol-2-ylmethoxy) benzyl] thiazolidine-2, 4-dione or a salt thereof can exert an excellent effect to promote healing in a dry eye model, and is useful as a therapeutic agent for keratoconjunctival disorders such as dry eyes, corneal ulcer, keratitis, conjunctivitis, superficial punctate keratopathy, corneal epithelial defects, conjunctival epithelial defects, keratoconjunctivitis sicca, superior limbic keratoconjunctivitis and filamentary keratitis.본 발명은 축합 복소환 화합물인 5-[4-(6-메톡시-1-메틸-1H-벤즈이미다졸-2-일메톡시)벤질]티아졸리딘-2,4-디온 또는 그 염의 새로운 의약 용도를 탐색하는 것을 과제로 한다. 5-[4-(6-메톡시-1-메틸-1H-벤즈이미다졸-2-일메톡시)벤질]티아졸리딘-2,4-디온 또는 그 염은 건성안 모델에 있어서 우수한 치유 촉진 효과를 발휘하고, 건성안, 각막 궤양, 각막염, 결막염, 점상 표층 각막증, 각막 상피 결손, 결막 상피 결손, 건성 각결막염, 상윤부 각결막염, 사상 각막염 등의 각결막 장해 치료제로서 유용하다.
