Abstract: The present invention provides a method for fixing an orthogonal angle of rollers in a seismic isolation system having a support mechanism by the rollers which are overlapped up and down and orthogonal to each other, Since a structure is shaken when a damping three of a damping mechanism exceeds seismic energy, a damping mechanism having a function of controlling and suppressing the damping force in accordance with the seismic energy is also produced. In order to maintain the orthogonal angle of the rollers, retaining materials having slight clearances which allow rolling of the rollers are attached to orthogonal parts of the rollers so as to fix the orthogonal angle. Meanwhile, energy absorption when a linear steel material is wound around a cylindrical material and continuously deformed by a horizontal force serves as the damping force, and by changing an axial section area of the linear steel material, an energy absorbing amount is controlled.