A battery pack includes a cell group, a spacer, a plurality of bus bars, and a bus bar holder. The cell group includes stacked unit cells, each including a cell body having a power generation element and an electrode tab having distal end portions bent along the stacking direction. The spacer is disposed between adjacent electrode tabs. The bus bars electrically connect the electrode tabs to each other. The bus bar holder that holds the bus bars. The bus bar holder includes a restricting member disposed between adjacent electrode tabs, and extends along the stacking direction to restrict the electrode tabs by sandwiching the electrode tabs with the spacer. Portions of the electrode tabs are welded to a surface of the bus bars facing the unit cells when the stacking direction positions of the portions of the electrode tabs are restricted by the restricting member and the spacer.