In the instillation medicine the oil content exists in stability, it is possible to disperse the oil content uniformly in the eye surface stimulus is little, the water instillation medicine which is effective to the prevention or remedy of the dry eye where the use impression is good is offered. The evaporation which features that the castor oil and the lecithin are contained the water instillation medicine which is effective to the prevention or remedy of the Shank type dry eye.点眼剤中で油分が安定に存在し、眼表面において油分を均一に分散することができ、刺激が少なく、使用感のよいドライアイの予防又は治療に有効な水性点眼剤を提供する。ヒマシ油及びレシチンを含有することを特徴とする蒸発亢進型ドライアイの予防又は治療に有効な水性点眼剤。