a tape or sheet form pressure-sensitive adhesive material which comprises a substrate which is obtainable by curing a curable resin composition comprising:(A) an organic elastomeric polymer which is liquid at room temperature and has, in a molecule, at least one silicon-containing group to the silicon atom of which at lease one hydroxyl group or hydrolyzable group is bonded and which is cross linkable through formation of a siloxane bond,(B) a curing catalystand(C) optionally a tackifier resin and a pressure-sensitive adhesive layer laminated on said substrate, which has good flexibility and increased adhesive force such as adhesive strength under shear and peel strength.