Provided is an compact assembled battery wherein the fastening force at a fixing portion between a bus bar and an external terminal cable has been improved. This assembled battery comprises: a batterygroup wherein a plurality of cells having electrode terminals are stacked; a plate-shaped member disposed at an end portion of the battery group; and a cell holder disposed between the plate-shaped member and the battery group. The assembled battery is characterized in that the cell holder has a terminal fixing portion for the assembled battery, and the plate-shaped member has an overlapping portion that overlaps with the terminal fixing portion.