Abstract: A storage battery is provided in which an expand grid is improved with respect to the widths of grid wires 1b, the sectional areas of nodes 1e, and the shapes of meshes 1c, whereby the productivity of the expand grid can be enhanced and the life performance can be improved. As means for attaining the object, a storage battery in which an expand grid is used as a battery plate, the expand grid being a grid member which is formed by expanding a side portion of a collector frame portion 1a of a metal sheet 1 to connect a large number of grid wires 1b to one another in a net-like shape, is configured so that widths of grid wires 1b of a row which is directly connected to the collector frame portion 1a of the expand grid, and a lateral end row are larger than widths of grid wires 1b of at least one of intermediate rows.