Seismic isolation mechanism

A seismic isolation mechanism comprising:

• a seismic isolation apparatus which is installed at one vertical end thereof on a superstructure and installed at another vertical end thereof on a foundation or a substructure to isolate the vibration of the superstructure with respect to the foundation or the substructure;
• one attenuation damper which is connected at one horizontal end thereof to the superstructure and connected at another horizontal end thereof to a portion of the seismic isolation apparatus between the one end and the other end thereof to attenuate the vibration of the superstructure with respect to the foundation or the substructure as it is extended and contracted in a horizontal direction;
• and another attenuation damper which is connected at one horizontal end thereof to the foundation or the substructure and connected at another horizontal end thereof to the portion of the seismic isolation apparatus between the one end and the other end thereof to attenuate the vibration of the superstructure with respect to the foundation or the substructure as it is extended and contracted in the horizontal direction, wherein said one attenuation damper and said other attenuation damper are arranged in such a manner as to respectively extend in one direction which is a horizontal direction so that damping forces due to extension and contraction are simultaneously produced in said one attenuation damper and said other attenuation damper in the vibration of the superstructure with respect to the foundation or the substructure in the one direction,