In a sealed battery, an outer case made of metal has a flange part and a concave part. An electric power generating element has an electrode body and electrolyte stored in the concave part. The electrode body has positive and negative electrodes connected to corresponding electrode leads, respectively. The flange part extends from the outer periphery of the outer case to the outside. The concave part is covered and sealed by a metal plate. The metal plate and one surface of the flange part are thermally bonded together through a metal-adhesive resin film. The metal plate projects toward the outside of the flange part. This projected part of the metal part is bent with the metal adhesive resin film toward the other surface of the flange part. The bent metal part and the other surface of the flange part are thermally bonded with the metal adhesive resin film.