The invention provides a battery module capable of restraining an increase in manufacturing costs and reducing a height dimension of the battery module. The battery module includes: a cell-stacked body (2) in which a plurality of cells (21) are stacked; and a module case (3) for holding the cell-stacked body (2). The module case (3) includes a pair of side plates (5) for holding side surfaces of the cell-stacked body (2); a bottom plate (6) on which the cell-stacked body (2) is loaded; and a plate member (7) installed on an upper end portion of the pair of side plates (5) to cover at least a part of an upper surface of the cell-stacked body (2). A filler (8) is filled in a space (S1) formed between the plate member (7) and the upper surface of the cell-stacked body (2) and in a space (S2)formed between the side plate (5) and the side surface of the cell-stacked body (2).