The purpose of this research is to grasp the number and information of seismically isolated buildings (SIBs) that are expected flooded by a tsunami that is generated due to the Nankai Trough earthquake and to show the relation between the expected flooded area and SIBs. We gather information about SIBs in Japan and research the expectation of tsunami inundation in the Nankai Trough earthquake. In addition, we research the SIBs that are expected flooded by a tsunami due to this earthquake based on those results and compile these information.