An object of the present invention is to provide an electrode sheet that can be easily aligned. The electrode sheet 1 includes a sheet-like flexible substrate 10 and a biological signal acquisition unit 11 that is disposed on the flexible substrate 10 and acquires a biological signal of a biological body. The biological signal acquisition unit 11 is disposed on the flexible substrate 10. The biological signal obtained based on the irradiated light is obtained by irradiating the living body with light, which is disposed on the flexible substrate 10 and the electric signal acquisition unit 14 that can electrically acquire the biological signal that has been obtained. A plurality of optical signal acquisition units 15.本発明は、位置合わせが容易な電極シートを提供することを課題とする。電極シート１は、シート状のフレキシブル基板１０と、フレキシブル基板１０上に配置され、生体の生体信号を取得する生体信号取得部１１と、を備え、生体信号取得部１１は、フレキシブル基板１０に配置された生体信号を電気的に取得可能な電気信号取得部１４と、フレキシブル基板１０に配置され、生体に対して光を照射することにより、照射した光に基づいて得られた生体信号を取得する複数の光信号取得部１５と、を備える。
