PROBLEM TO BE SOLVED: To provide new prophylactic or therapeutic agents for keratoconjunctive diseases which are particularly caused by dry eye.SOLUTION: The prophylactic or therapeutic agents for the keratoconjunctive diseases include sofalcone which is an isoprenyl chalcone compound represented by formula (1) as an active ingredient. As for the prophylactic or therapeutic agents, the keratoconjunctive diseases are particularly preferably caused by the dry eye. Any of punctate superficial keratitis, corneal epithelial defect, conjunctival epithelial defect, corneal erosion, keratoconjunctivitis or corneal ulcer is preferable as the keratoconjunctive diseases caused by the dry eye. The dosage form of the prophylactic or therapeutic agents is preferably an instillation.COPYRIGHT: (C)2011,JPO&INPIT【課題】新規な角結膜疾患の予防又は治療剤の提供。【解決手段】下式で表されるイソプレニルカルコン化合物であるソファルコンを有効成分として含有する角結膜疾患の予防又は治療剤。該予防又は治療剤は、特に、ドライアイに起因するものであることが好ましい。該ドライアイに起因する角結膜疾患としては、点状表層角膜症、角膜上皮欠損、結膜上皮欠損、角膜びらん、角結膜炎、又は角膜潰瘍のいずれかであることが好ましい。該予防又は治療剤の投与形態は、点眼であることが好ましい。【選択図】図1