Generally, an exposed column base consists of anchor bolts and an elastic thick base plate. Restoring force characteristics of the column base are observed to be slip-type due to a gap between a nut of the anchor bolt and the base plate, caused by the plastic elongation of the anchor bolt. Strength and restoring force characteristics of the column base very under the influence of an axial force. The resisting mechanism and the models of restoring force characteristics of the column base subjected to bending moment and the axial force are proposed.