An assembled battery comprises: a plurality of battery cells; a housing having a plurality of first housing spaces for housing one end side of the plurality of battery cells and a plurality of second housing spaces for housing an other end side of the plurality of battery cells, and holding the plurality of battery cells; an adhesive portion in contact with the plurality of battery cells and the housing, and adhering the plurality of battery cells to the housing; and an insulation sheet located between the plurality of battery cells, wherein the housing includes a first frame body defining the plurality of first housing spaces and a second frame body defining the plurality of second housing spaces, and the insulation sheet is interposed between the first frame body and the second frame body, and is in contact with the adhesive portion.