Provided are a resin particle dispersion having redispersibility even after long-term storage, a method for producing the resin particle dispersion, and a cosmetic having redispersibility even after long-term storage. Step (I) of dispersing a polymerizable component containing a polymerizable monomer in an aqueous dispersion medium containing an inorganic component and a low molecular surfactant, and step (II) of obtaining resin particles by polymerizing the polymerizable component , A powdering step (IV) for obtaining a powder of resin particles from an aqueous dispersion medium containing resin particles after the step (II), a resin obtained by mixing the resin particles, water, alcohol and organic acid after the step (IV) A method for producing a resin particle dispersion, comprising a mixing step (V) for obtaining a particle dispersion, wherein the organic acid is a specific organic acid. [Selection figure] None長期保管後でも再分散性を有する樹脂粒子分散液及び樹脂粒子分散液を製造する方法と、長期保管後でも再分散性を有する化粧料とを提供する。 無機成分及び低分子界面活性剤を含む水性分散媒中に、重合性単量体を含む重合性成分を分散させる工程（Ｉ）、前記重合性成分を重合させて樹脂粒子を得る工程（ＩＩ）、前記工程（ＩＩ）後に樹脂粒子を含む水性分散媒から樹脂粒子の粉体を得る粉体化工程（ＩＶ）、前記工程（ＩＶ）後に前記樹脂粒子、水、アルコール、有機酸を混合し樹脂粒子分散液を得る混合工程（Ｖ）を含み、前記有機酸が特定の有機酸である、樹脂粒子分散液の製造方法。【選択図】 なし
