TECHNOLOGY FOCUS - POLYMERS - Preferred Properties: The silicone rubber or gel layer has hardness of 200 or less in penetration by 1/4 corn prescribed based on JIS K2220 and 50 or less measured using type A durometer based on by JIS K6253. The silicone rubber adhesive bond layer has degree of plasticity in unhardened state at 23 degrees C of 100-600 measured using Williams plastometer. Preferred Composition: Liquid silicone rubber or gel composition used during hydrosilylation reaction is addition cure-type liquid silicone rubber or gel composition containing organopolysiloxane (A) of formula: RaR1bSiO(4-a-b)/2 (I) having alkenyl group(s) bonded with silicon atom in 1 molecule, organo-hydrogen-polysiloxane (B) having two or more hydrogen atoms bonded with silicon atom in 1 molecule and effective dose of platinum-based catalyst (C). The content of silicon atom-bonded hydrogen atoms in organo-hydrogen-polysiloxane (B) per silicon atom-bonded alkenyl group in organopolysiloxane (A) is 0.3-10. The outer peripheral portion of front side panel and outer peripheral portion of back side panel or sheet is silicone rubber or gel layer non-formation portion.R=alkenyl;R1=monovalent hydrocarbyl (optionally substituted by halo) which does not include aliphatic unsaturated bond;a=0.0001-0.2;b=1.7-2.2;anda+b=1.9-2.4.Preferred Process: The silicone rubber adhesive bond layer is arranged in non-formation portion. The silicone rubber adhesive bond layer is formed using silicone rubber adhesive agent containing 100 parts mass organopolysiloxane (D) of formula: R11xSiO(4-x)/2 containing 2 or more alkenyl groups in 1 molecule, 5-200 parts mass reinforcing silica (E), effective dose of platinum-based catalyst (F) and organo-hydrogen-polysiloxane (G) containing 2 or more hydrogen atoms bonded with silicon atom in 1 molecule, as essential components. The ratio of hydrogen atom bonded with silicon atom in the organo-hydrogen-polysiloxane (G) is 0.3-10 with respect to one alkenyl group in organopolysiloxane (D). The silicone rubber adhesive agent is molded into cord-like material and positioned in frame shape along outer peripheral portion of surface panel or outer peripheral portion of back side panel or sheet, molded to square frame shape to form silicone rubber adhesive bond layer.R11=optionally substituted monovalent hydrocarbyl containing 0.001-1 mol% alkenyl;andx=1.95-2.05.