To provide a base isolation structure obtained using a rubber composition capable of improvin temperature dependency while maintaining high buckling generation distortion.

The base isolation structure uses the rubber composition containing a rubber component that contains 25 mass% or more of a butadiene-based polymer having a molecular weight distribution (Mw/Mn) of 1.6-3.5, a cis-1,4 bond content in a 1,3-butadiene monomer unit being 98% or larger and a vinyl bond content being 0.3% or smaller in Fourier transform infrared spectroscopy measurement.