In the electroencephalogram measurement etc., it is a prescription (gel that has low adhesive strength and can withstand pressure on the tip of the terminal etc.) suitable for the skin side, and for the electrode element on the opposite side of the skin An object of the present invention is to provide a gel sheet having sufficient adhesive strength. It is the gel sheet 1 which has the laminated structure of A layer 10 and B layer 20, Comprising: The storage elastic modulus in 23 degreeC and 10 Hz of A layer 10 is 12000-40000 Pa, The storage elastic modulus in 23 degreeC and 10 Hz of B layer 20 Is characterized in that it is 2000-10000 Pa.
