An object of the present invention is to provide a gel sheet comprising an intermediate base, having no variation in adhesiveness.A gel sheet 1 comprising a gel material 10 and an intermediate base 20 embedded in the gel material 10, wherein when T represents the thickness of the gel sheet 1, and S represents the amplitude of the intermediate base 20, a relation represented by the following expression (1) is satisfied: S/T≤；0.4 . . . (1)
