A battery module comprising a plurality of cells, a cooling plate having a plate surface on which the plurality of cells are arranged, and a channel part which is formed in the cooling plate and through which coolant can flow, wherein the cooling plate further includes: a coolant entrance placed at a position close to a central portion in a lateral width direction of the end surface part, the coolant exit through which the coolant flows out from in a direction opposite from a direction of the coolant flowing through the coolant entrance, the coolant exit is placed at a position close to an outer side in the lateral width direction of the end surface part, wherein the channel part includes a first channel part, a second channel part, a third channel part and a fourth channel part which extend in an arrangement direction of the plurality of cells, and a first communication part which is configured to turn a flowing direction of the coolant in the first channel part and the second channel part, a second communication part which is configured to turn a flowing direction of the coolant in the second channel part and the third channel part, and a third communication part which is configured to turn a flowing direction of the coolant in the third channel part and the fourth channel part, wherein the coolant in the first channel part and the coolant in the second channel part flow in opposite directions on opposing sides of a first partition part, the coolant in the second channel part and the coolant in the third channel part flow in opposite directions on opposing sides of a second partition part, the coolant in the first communication part and the coolant in the third communication part flow in opposite directions on opposing sides of a third partition part, the coolant in the fourth channel part and the coolant in the first channel part flow in opposite directions on opposing sides of a fourth partition part, characterized in that the fourth channel part extends in parallel in the arrangement direction along the first channel part with the fourth partition part formed from a plate-shaped member interposed between the fourth channel part and the first channel part, the channel part is configured to allow heat exchange between coolant in the first channel part and coolant in the fourth channel part, through the forth partition part. a coolant entrance placed at a position close to a central portion in a lateral width direction of the end surface part, the coolant exit through which the coolant flows out from in a direction opposite from a direction of the coolant flowing through the coolant entrance, the coolant exit is placed at a position close to an outer side in the lateral width direction of the end surface part, wherein the channel part includes a first channel part, a second channel part, a third channel part and a fourth channel part which extend in an arrangement direction of the plurality of cells, and a first communication part which is configured to turn a flowing direction of the coolant in the first channel part and the second channel part, a second communication part which is configured to turn a flowing direction of the coolant in the second channel part and the third channel part, and a third communication part which is configured to turn a flowing direction of the coolant in the third channel part and the fourth channel part, wherein the coolant in the first channel part and the coolant in the second channel part flow in opposite directions on opposing sides of a first partition part, the coolant in the second channel part and the coolant in the third channel part flow in opposite directions on opposing sides of a second partition part, the coolant in the first communication part and the coolant in the third communication part flow in opposite directions on opposing sides of a third partition part, the coolant in the fourth channel part and the coolant in the first channel part flow in opposite directions on opposing sides of a fourth partition part, characterized in that the fourth channel part extends in parallel in the arrangement direction along the first channel part with the fourth partition part formed from a plate-shaped member interposed between the fourth channel part and the first channel part, the channel part is configured to allow heat exchange between coolant in the first channel part and coolant in the fourth channel part, through the forth partition part.