A battery module, comprising: a battery cell stack in which a plurality of battery cells are stacked; and a bus bar to which electrode leads respectively provided at the plurality of battery cells are coupled, wherein the bus bar presses the electrode leads so that the bus bar and the electrode leads are electrically connected, wherein the bus bar includes: a base member electrically connected to the electrode leads; and a rotating member rotatably coupled to the base member to press the electrode leads interposed between the rotating member and the base member, wherein the rotating member is provided in a pair, and the pair of rotating members (220a, 220b) are respectively coupled to both side ends of the base member, characterized in that the base member includes: a pair of horizontal members (211a, 211b) formed in a horizontal direction and disposed at an upper side and a lower side to be spaced apart from each other; and a vertical member formed in a vertical direction to connect center portions of the pair of horizontal members (211a, 211b) spaced apart from each other, wherein a length of the horizontal member in the horizontal direction is longer than a length of the vertical member in the horizontal direction to form a space between both side ends of the pair of horizontal members (211a, 211b) spaced apart from each other, and wherein the pair of rotating members (220a, 220b) are rotatably disposed in the space respectively formed between the ends of the pair of horizontal members (211a, 211b). a battery cell stack in which a plurality of battery cells are stacked; and a bus bar to which electrode leads respectively provided at the plurality of battery cells are coupled, wherein the bus bar presses the electrode leads so that the bus bar and the electrode leads are electrically connected, wherein the bus bar includes: a base member electrically connected to the electrode leads; and a rotating member rotatably coupled to the base member to press the electrode leads interposed between the rotating member and the base member, wherein the rotating member is provided in a pair, and the pair of rotating members (220a, 220b) are respectively coupled to both side ends of the base member, characterized in that the base member includes: a pair of horizontal members (211a, 211b) formed in a horizontal direction and disposed at an upper side and a lower side to be spaced apart from each other; and a vertical member formed in a vertical direction to connect center portions of the pair of horizontal members (211a, 211b) spaced apart from each other, wherein a length of the horizontal member in the horizontal direction is longer than a length of the vertical member in the horizontal direction to form a space between both side ends of the pair of horizontal members (211a, 211b) spaced apart from each other, and wherein the pair of rotating members (220a, 220b) are rotatably disposed in the space respectively formed between the ends of the pair of horizontal members (211a, 211b). a base member electrically connected to the electrode leads; and a rotating member rotatably coupled to the base member to press the electrode leads interposed between the rotating member and the base member, wherein the rotating member is provided in a pair, and the pair of rotating members (220a, 220b) are respectively coupled to both side ends of the base member, characterized in that the base member includes: a pair of horizontal members (211a, 211b) formed in a horizontal direction and disposed at an upper side and a lower side to be spaced apart from each other; and a vertical member formed in a vertical direction to connect center portions of the pair of horizontal members (211a, 211b) spaced apart from each other, wherein a length of the horizontal member in the horizontal direction is longer than a length of the vertical member in the horizontal direction to form a space between both side ends of the pair of horizontal members (211a, 211b) spaced apart from each other, and wherein the pair of rotating members (220a, 220b) are rotatably disposed in the space respectively formed between the ends of the pair of horizontal members (211a, 211b). a pair of horizontal members (211a, 211b) formed in a horizontal direction and disposed at an upper side and a lower side to be spaced apart from each other; and a vertical member formed in a vertical direction to connect center portions of the pair of horizontal members (211a, 211b) spaced apart from each other, wherein a length of the horizontal member in the horizontal direction is longer than a length of the vertical member in the horizontal direction to form a space between both side ends of the pair of horizontal members (211a, 211b) spaced apart from each other, and wherein the pair of rotating members (220a, 220b) are rotatably disposed in the space respectively formed between the ends of the pair of horizontal members (211a, 211b).