The purpose of the present invention is to provide a gel sheet including an intermediate base material without variation in adhesiveness.A gel sheet 1 of the present invention comprises a gel material 10, and an intermediate base material 20 embedded in the gel material 10, and is characterized by satisfing the relationship of the following formula (1): S/T≦0.4 (1) when the thickness of the gel sheet 1 is set as T, and the amplitude of the intermediate base material 20 is set as S.本發明之目的係提供一種黏著性無變異的包含中間基材之凝膠片。本發明之凝膠片1係包含凝膠材10、及被埋入至凝膠材10中的中間基材20，其特徵在於：將凝膠片1的厚度設為T，將中間基材20的振幅設為S時，滿足下述數式(1)：S/T≦0.4 (1)的關係。
