Provided are a novel pharmaceutical use of PPARδ agonist such as a therapeutic agent for neurotrophic keratopathy, an improving agent for decrease of corneal sensitivity and the like, each containing [3-[2-[4-isopropyl-2-(4-trifluoromethyl)phenyl-5-thiazolyl]ethyl]-5-methyl-1,2-benzisoxazol-6-yl]oxyacetic acid or a pharmacologically acceptable salt thereof.