Laminated battery and method for manufacturing laminated battery

This laminated battery is provided with: an outer packaging body; a membrane electrode assembly having a plurality of first electrode plates and a plurality of second electrode plates alternately laminated in the lamination direction; and a first tab disposed on one side of the membrane electrode assembly. The first electrode plate includes a first electrode current collector including first connection regions and first effective regions adjacent to each other, and a first electrode active material layer provided in the first effective regions, the plurality of first connection regions overlap to form a first connection portion, and the first tab is joined to the first connection portion. The first connection portion includes a first fixing portion provided at a position different from that of the first joint when viewed in the stacking direction, and the first fixing portion fixes the first connection regions to each other. 层叠型电池具备：外包装体、具有沿层叠方向交替层叠的多个第1电极板和多个第2电极板的膜电极接合体、和在膜电极接合体的一侧配置的第1接头。第1电极板包括：包含相互邻接的第1连