Abstract: The present invention relates to an earthquake-proofing device wherein a superstructure is placed and supported for horizontal movement on a foundation structure so as to increase the natural vibration period of the superstructure, thereby protecting the superstructure against earthquake energy and traffic vibration. More particularly, the outer periphery of an elastic body, visco-elastic body or viscous body which hardly exhibits rigidity by itself is surrounded by a restrainer which restrains it from bulging outward, thereby enabling the body to develop high vertical rigidity while allowing it to retain horizontal deformability, the body being used as a load carrier. The restrainer and/or load carrier absorbs vibration energy by frictional damping action.