Japan is a land of earthquakes, located on the Pacific Rim seismic zone. Japan has suffered enormous damage from numerous strong earthquakes. We have used this valuable experience to make effective earthquake proof structures. In particular, development of seismic resistant design forbridges has been pursued, As bridges suffer serious damage during earthquake. Recently, conventional "anti-earthquake design" to build rigid structures has been superceded by "seismic isolation design". This is considered the main design technology for future measures against earthquakes because it is based on the concept of reducing the seismic force transferred into a struture. This results in dramatically increased resistance to earthquakes. Anti-earthquake measures will become more important for ¨next-generation¨ transportation, such as linear motor cars which incoporate fragile advanced technology. Seismic isolation design, with its improved safety and other advantages will be implemented in other areas. In Japan, one of the worlds most earthquake prone countries, thorough precautions against earthquakes are required. Conventional "anti-earthquake bridge design" which uses the concept of resisting earthquakes through the strength of its construction. Recently, "load dispersing bridges" or "seismic isolated bridges" have been adopted: the former will support a superstructure elastically at many points with rubber bearings and disperse the inertial force of the superstructure to protect it from earthquakes. The latter will support the superstructure with quake-absorbing bearings strong enough to protect it from major earthquakes such as the Tokyo Earthquake of 1923, and avoid damage by increasing the period of vibration and absorbing the energy associated with earthquake induced vibration. Conventional bridges with earthquake resistant design Horizontal force is concentrated on a rigid pier. Load dispersing bridge (Base Isolated) RB and LRB are used to disperse the horizontal force induced on each pier. Seismic isolation bridge LRB is used to increase the vibration period and damp the vibration.