A vacuum cleaner may include a cleaner body including a suction motor for generating suction force, a suction unit communicating with the cleaner body and suctioning air and dust, and a battery assembly for supplying power to the suction motor. The battery assembly may include a plurality of battery cells, an inner case including a plurality of cell cases having the plurality of battery cells respectively accommodated therein and spaced apart from each other, and an outer case having the inner case accommodated therein and including a flow hole in which air flows.