BATTERY PACK

Provided is a battery pack in which a bus bar for modules is provided on one side of a plurality of battery modules in a height direction, and connects the battery modules that are adjacent to each other among the plurality of battery modules, in series. In addition, the bus bar for modules includes a first bus bar piece that is provided in a battery module on one side between the battery modules that are adjacent to each other, and a second bus bar piece that is provided in a battery module on the other side and is different from the first bus bar piece, and a connection portion that connects the first bus bar piece and the second bus bar piece.