PROBLEM TO BE SOLVED: To provide production methods of a treatment agent of cataract, the methods being able to pull out (or dissolve) a mineral component without using inorganic acid in a short time.SOLUTION: A production method of a treatment agent of cataract comprises pulverizing a rock, mixing a pulverized rock and an aqueous solution comprising an organic acid to obtain a mixed aqueous solution, further mixing a plant extract extracted from a plant in the mixed aqueous solution to obtain a mixed solution, and reducing the volume of the mixed solution from 1/130 to 1/170 in (a) vacuum drying treatment of the mixed solution. The production method of a treatment agent of a cataract comprises adding a seaweed to the mixed solution. The rock is igneous rock and preferably granite. Furthermore, the organic acid is citric acid or acetic acid, the plant is Raphanus sativus var. longipinnatus, and preferably the seaweed is Laminariaceae.SELECTED DRAWING: Figure 1【課題】短時間で、無機酸を用いることなくミネラル成分を取り出す（あるいは溶解させる）ことができる白内障治療薬の製造方法の提供。【解決手段】岩石を粉砕する工程と、粉砕した岩石と有機酸を含む水溶液とを混合して混合水溶液を得る工程と、前記混合水溶液に、植物から抽出された植物抽出物をさらに混合して混合液を得る工程と、前記混合液を真空乾燥処理すること（ａ）で、１／１３０～１／１７０に減容する工程と、を含む白内障治療薬の製造方法。前記混合液に海藻を加える、白内障治療薬の製造方法。前記岩石が火成岩であり、好ましくは花崗岩である、白内障治療薬。更に前記有機酸がクエン酸又は酢酸であり、前記植物が大根であり、前記海藻が昆布であることが好ましい、白内障治療薬の製造方法。【選択図】図１
