PROBLEM TO BE SOLVED: To provide an aqueous ophthalmic composition having high storage stability.SOLUTION: Provided is an aqueous ophthalmic composition comprising xanthan gum and a pharmaceutical compound stable in an acidic range and having a pH of less than 5.5.SELECTED DRAWING: None【課題】貯蔵安定性の高い眼科用水性組成物の提供。【解決手段】キサンタンガムと酸性領域で安定な医薬化合物とを含み、pH5.5未満である、眼科用水性組成物。【選択図】なし