A bus bar module comprising: a case that is suitable for being assembled to a battery assembly including a plurality of single cells; and a bus bar that is supported by the case and that is formed of a conductive metal plate that is suitable for being electrically connected to electrodes of the single cells of the battery assembly, wherein the bus bar includes: a plurality of electrical connection portions configured to electrically connect and fix a plurality of the electrodes of the single cells; and a plurality of convex-shaped projections that are each formed between the electrical connection portions and protrude in a direction away from the single cells, the convex-shaped projections including a pair of side plate portions facing each other and an upper plate portion provided continuously with upper edges of the side plate portions, wherein the case includes: a bus bar housing portion in which the bus bar is housed; and a plate-shaped support portion that is provided in each projection of the bus bar housed in the bus bar housing portion and abuts against a back surface of the upper plate portion to support the bus bar, the support portion extending in a direction orthogonal to an arrangement direction of the electrical connection portions, wherein a peripheral wall portion of the bus bar housing portion includes a pair of long side portions and a pair of short side portions, wherein the short side portions are provided continuously with both ends of the long side portion, wherein the support portion is integrally formed being bridged over the long side portions of the peripheral wall portion, and a plurality of the support portions are provided at intervals in a longitudinal direction of the bus bar housing portion, and wherein the support portion has a width smaller than the interval between inner side surfaces of the side plate portions of the projection. a case that is suitable for being assembled to a battery assembly including a plurality of single cells; and a bus bar that is supported by the case and that is formed of a conductive metal plate that is suitable for being electrically connected to electrodes of the single cells of the battery assembly, wherein the bus bar includes: a plurality of electrical connection portions configured to electrically connect and fix a plurality of the electrodes of the single cells; and a plurality of convex-shaped projections that are each formed between the electrical connection portions and protrude in a direction away from the single cells, the convex-shaped projections including a pair of side plate portions facing each other and an upper plate portion provided continuously with upper edges of the side plate portions, a plurality of electrical connection portions configured to electrically connect and fix a plurality of the electrodes of the single cells; and a plurality of convex-shaped projections that are each formed between the electrical connection portions and protrude in a direction away from the single cells, the convex-shaped projections including a pair of side plate portions facing each other and an upper plate portion provided continuously with upper edges of the side plate portions, wherein the case includes: a bus bar housing portion in which the bus bar is housed; and a plate-shaped support portion that is provided in each projection of the bus bar housed in the bus bar housing portion and abuts against a back surface of the upper plate portion to support the bus bar, the support portion extending in a direction orthogonal to an arrangement direction of the electrical connection portions, a bus bar housing portion in which the bus bar is housed; and a plate-shaped support portion that is provided in each projection of the bus bar housed in the bus bar housing portion and abuts against a back surface of the upper plate portion to support the bus bar, the support portion extending in a direction orthogonal to an arrangement direction of the electrical connection portions, wherein a peripheral wall portion of the bus bar housing portion includes a pair of long side portions and a pair of short side portions, wherein the short side portions are provided continuously with both ends of the long side portion, wherein the support portion is integrally formed being bridged over the long side portions of the peripheral wall portion, and a plurality of the support portions are provided at intervals in a longitudinal direction of the bus bar housing portion, and wherein the support portion has a width smaller than the interval between inner side surfaces of the side plate portions of the projection.