TECHNOLOGY FOCUS - POLYMERS - Preferred Components: In the adhesive seal material, a porous screen is provided as the non-adhesive layer, where the covering ratio of the non-adhesive layer is 5-50%. The rubber-based adhesive layer is formed from a butyl-rubber-based adhesive composition. The adhesive seal material is trimmed into a size of 2x 2 cm to produce a sample. The surface of the rubber-based adhesive layer of the sample where the non-adhesive layer is formed is brought into contact with an aluminum plate while a load of 30 g on the sample, and the sample is pulled in a direction along the aluminum plate at a speed of 300 mm/minute, by applying a frictional force (defined as a stress) of 0.01-1 N/4 cm2. In the seal structure, the adhesive seal material is bonded to the end portion of the solar cell panel so that the surface of the rubber-based adhesive layer, where the non-adhesive layer is formed, comes in contact with the fixing member. EXAMPLE - The rubber-based adhesive layer (comprised of reclaimed butyl rubber (70 parts by weight), JSR BUTYL 268 (RTM: Butyl rubber) (30 parts by weight), heavy calcium carbonate (100 parts by weight ), light calcium carbonate (0.1 parts by weight), and HV-30010 (RTM: Polybutene) (10 parts by weight)) was kneaded at 120 degrees C to obtain a master batch. The above master batch was charged into a 75 l pressure kneader, and then Escorez 1202U (RTM: Tackifier) (40 parts by weight), HV-30010 (RTM: Polybutene) (50 parts by weight), and Cumic Process Oil 8465 (RTM: Process oil) (5 parts by weight) were added to the kneader and kneaded at 120 degrees C, under applied pressure of 0.1-0.3 MPa to obtain a rubber-based adhesive composition. The rubber-based adhesive composition was calendared with a calendar roll to form a rubber-based adhesive layer having a thickness of 200 mu m, and laminated on each of the top surface and back surface of a polyethylene terephthalate film having a thickness of 25 mu m. Then a released sheet was laminated on each of the both surfaces (the top surface of a first adhesive layer and the back surface of a second adhesive layer) of the obtained rubber-based adhesive layer. Then porous screen (a mesh screen made of polyester, having a thickness of 0.50 mm, a basis weight of 70 g/m2, a mesh size of 2.0 mmx 1 .5 mm and a coverage ratio of 14% was used) was bonded as a non-adhesive layer to the top surface of the first adhesive layer under a pressure of 0.2 MPa so that the meshes of the net had uniform shapes to provide the adhesive seal material for an end portion of a solar cell panel.