PROBLEM TO BE SOLVED: To provide a cosmetic or a skin external preparation containing methyl hesperidin and/or a derivative thereof which is improved in formulation performance such as effects and storage stability compared with a single substance of methyl hesperidin and/or the derivative.SOLUTION: There is provided a cosmetic or a skin external preparation which contains methyl hesperidin and/or a derivative thereof and an effect enhancing agent for the methyl hesperidin and/or a derivative of the methyl hesperidin.COPYRIGHT: (C)2014,JPO&INPIT【課題】メチルヘスペリジン及び/又はその誘導体を含む化粧料または皮膚外用剤であって、メチルヘスペリジン及び/又はその誘導体の単体での性能と比べて、効果、保存安定性等の製剤性能が向上した化粧料または皮膚外用剤を提供する。【解決手段】本発明の化粧料または皮膚外用剤は、メチルヘスペリジン及び/又はその誘導体、並びに前記メチルヘスペリジン及び/又は前記メチルヘスペリジンの誘導体の効果促進剤を含有する。【選択図】なし