A battery module according to the present invention comprises: a battery cell stack in which a plurality of battery cells are stacked in one direction; a module frame accommodating the battery cell stack; a bus bar electrically connecting the battery cell stack to an external member; and an end plate which covers the front surface or the back surface of the battery cell stack, is coupled to a bus bar frame, on which the bus bar is mounted, and to the module frame, and covers the bus bar frame, wherein at least one opening is formed in the end plate, a protrusion of the bus bar is exposed to the outside through the opening, and a gap between the protrusion of the bus bar and the opening is sealed by a gasket.