PROBLEM TO BE SOLVED: To provide ophthalmic aqueous solutions containing a PGF2α analogue and substantially free of preservatives.SOLUTION: An ophthalmic aqueous solution for treating ocular hypertension and/or glaucoma is filled in a resin container; contains 0.0015% w/v of tafluprost, 0.075 to 0.1% w/v of polysorbate 80, 0.01 to 0.1% w/v of disodium edetate, optionally, a buffer, pH adjusting agent and isotonizing agent commonly used in eye drops; does not contain a preservative; and is a unit dosage form, the resin container being a polyethylene container.SELECTED DRAWING: None【課題】PGF2α類縁体を含み、かつ実質的に保存剤を含まない点眼水溶液の提供。【解決手段】樹脂容器に充填された、0.0015%w/vのタフルプロストと、0.075~0.1%w/vのポリソルベート80と、0.01~0.1%w/vのエデト酸二ナトリウムと、必要に応じて、点眼液で常用されている緩衝剤、pH調整剤及び等張化剤とを含み、かつ保存剤を含まない、単位用量形態である高眼圧症及び/又は緑内障の治療用の点眼水溶液であって、前記樹脂容器はポリエチレン製容器である、前記点眼水溶液。【選択図】なし