The invention relates to providing a method for more conveniently evaluating stratum corneum condition. A stratum corneum sheet is contacted with a solution of a water-soluble dye, and the staining intensity or fluorescence intensity is measured to allow convenient evaluation of the stratum corneum condition. There is further provided a method for evaluating the ameliorating effect of a cosmetic or cosmetic treatment on the stratum corneum, by implementing the method for evaluating stratum corneum condition using a water-soluble dye according to the invention.本發明之課題係關於提供一種更簡便地評價角質層狀態之方法。使水溶性染料之溶液接觸角質層片，測定染色強度或螢光強度，藉此，可簡便地進行角質層狀態之評價。藉由應用本發明之使用水溶性染料之角質層狀態之評價方法，進而提供一種對化粧料或美容處理之角質層改善效果進行評價之方法。
