A bus bar module comprising: a case that is suitable for being assembled to a battery assembly formed of a plurality of single cells; 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 cell; and a plurality of convex-shaped projections including a pair of side plate portions facing each other and an upper plate portion provided continuously with the upper edges of the side plate portions and that are formed between the electrical connection portions and protrude in a direction away from the single cell, wherein the case includes: a bus bar housing portion in which the bus bar is housed; and a plate-shaped support portion that is disposed in each projection of the bus bar and abuts against a back surface of the upper plate portion of the projection to support the bus bar, wherein the support portion includes a base portion protruding in an arrangement direction of the electrical connection portions, and, wherein the base portion enters an inside of the projection, and wherein the bus bar module is configured such that if the support portion is displaced relative to the bus bar a side surface of the base portion of the support portion abuts against an inner side surface of the projection. a case that is suitable for being assembled to a battery assembly formed of a plurality of single cells; 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 cell; and a plurality of convex-shaped projections including a pair of side plate portions facing each other and an upper plate portion provided continuously with the upper edges of the side plate portions and that are formed between the electrical connection portions and protrude in a direction away from the single cell, a plurality of electrical connection portions configured to electrically connect and fix a plurality of the electrodes of the single cell; and a plurality of convex-shaped projections including a pair of side plate portions facing each other and an upper plate portion provided continuously with the upper edges of the side plate portions and that are formed between the electrical connection portions and protrude in a direction away from the single cell, wherein the case includes: a bus bar housing portion in which the bus bar is housed; and a plate-shaped support portion that is disposed in each projection of the bus bar and abuts against a back surface of the upper plate portion of the projection to support the bus bar, a bus bar housing portion in which the bus bar is housed; and a plate-shaped support portion that is disposed in each projection of the bus bar and abuts against a back surface of the upper plate portion of the projection to support the bus bar, wherein the support portion includes a base portion protruding in an arrangement direction of the electrical connection portions, and, wherein the base portion enters an inside of the projection, and wherein the bus bar module is configured such that if the support portion is displaced relative to the bus bar a side surface of the base portion of the support portion abuts against an inner side surface of the projection.