A battery pack includes a plurality of cylindrical cell modules, each formed by serially connecting a plurality of unit cells; a cell box in which the cell modules are contained in a manner such that the cell modules are arranged parallel to each other; a plurality of holding members fit to outer peripheries of the cell modules so as to arrange the cell modules in a zigzag manner along axes of the cell modules, in a manner such that the holding members make contact with each other and a gap is secured between every adjacent cell module; and an elastic body inserted between the holding members and a frame of the cell box. Preferably, a pushing member provided between the elastic body and the holding members is provided.