PROBLEM TO BE SOLVED: To provide a probe that makes a painless needle inserted to a moderate depth to enable minimally invasive skin potential measurement, a skin potential measuring apparatus, a skin potential measuring method, and a beauty method.SOLUTION: A probe includes a hollow needle with an outside diameter of 0.003-0.4 mm and a length of 0.2-40 mm. In the hollow needle, a tip and a terminal are connected together by a salt bridge. A skin potential measuring apparatus includes the probe. The skin potential measuring apparatus is used for a skin potential measuring method. The skin potential measuring apparatus is used for a beauty method.SELECTED DRAWING: Figure 2【課題】本発明は、無痛針を適度な深さで刺入することで、低侵襲な表皮電位測定を可能にする、プローブ、表皮電位測定装置、表皮電位測定方法、美容方法を提供することを目的とする。【解決手段】外径０．００３～０．４ｍｍ、長さ０．２～４０ｍｍの中空針を含み、中空針において先端と末端とが塩橋により連絡されている、プローブ、該プローブを含む表皮電位測定装置、該表皮電位測定装置を用いる表皮電位測定方法、該表皮電位測定装置を用いる美容方法。【選択図】図２
