A protection element attachment tab made of a single flat metal plate and mounted on positive and negative electrode terminals of a cylindrical cell to connect between the positive electrode terminal formed on one end surface of the cell and the negative electrode terminal formed on another end surface of the cell with a protection element that prevents overdischarge between the electrode terminals. The protection element attachment tab includes a planar region facing the end surface when mounted on the electrode terminal; a first protrusion protruding from the planar region in a direction along the planar region, a leading end of the first protrusion protruding outward from the end surface of the cell when the planar region is mounted on the electrode terminal; and a second protrusion shorter than the first protrusion, protruding from the planar region in a direction different from the first protrusion along the planar region.