PROBLEM TO BE SOLVED: To provide a technique to improve the emission of an oil-soluble active ingredient in a skin external preparation comprising the oil-soluble active ingredient.SOLUTION: The present invention provides a method for producing a skin external preparation of an oil-in-water emulsifier form comprising an oil-soluble active ingredient, comprising a step of controlling an average emulsified particle size to be 10 μm or less.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】油溶性の有効成分を含む皮膚外用剤における、該有効成分の放出性を向上する技術を提供する。【解決手段】油溶性の有効成分を含む水中油型の乳化剤形の皮膚外用剤の製造方法であって、平均乳化粒子径を10μm以下に制御することを特徴とする、製造方法。【選択図】図1