The objective of the present invention is to provide a gel sheet having a prescription with an adhesive force on the skin side suitable for skin in electroencephalogram measurement and the like (a gel that has low adhesive force and can withstand pressure applied to the distal end of a terminal), and having sufficient adhesive force with respect to an electrode element on the side opposite to the skin.A gel sheet (1) of the present invention has a laminated structure of an A layer (10) and a B layer (20), wherein the storage modulus of the A layer (10) at 23℃ , 10 Hz is 12000 to 40000 Pa, and the storage modulus of the B layer (20) at 23℃, 10 Hz is 2000 to 10000 Pa.本發明之目的在於提供一種於腦波測定等之中,具有使皮膚側的黏著力適合於肌膚之處方(黏著力低,且亦可承受端子等的前端加壓之凝膠),同時對於與皮膚為相反側之電極元件具有充分的黏著力之凝膠片。本發明為一種具有A層(10)與B層(20)之積層構造之凝膠片(1),A層(10)於23℃、10Hz時之儲存彈性模數為12000至40000Pa,B層(20)於23℃、10Hz時之儲存彈性模數為2000至10000Pa。1‧‧‧凝膠片10‧‧‧A層20‧‧‧B層
