To provide a base isolation support body to simplify formation of a covering layer to improve weather resistance, prevent the occurrence of oxidation deterioration, follow deformation of the internal part of the base isolation support body, and eliminate a fear of a crack occurring.

In a base isolation body formed that a covering layer 4 is formed on the outer peripheral surface of a laminate 3 where a rigid plate 1 having rigidity and a flexible plate 2 having viscoelasticity are laminated and adhered together and the outer peripheral surface of the covering layer 4 is covered with a silicone rubber layer 5, the covering layer is formed of natural rubber, and the silicone rubber layer is formed by coating the outer surface of the covering layer with solution-form silicone rubber.