A battery module disclosed. The battery module includes a module case; first and second battery groups disposed inside the module case to be spaced apart from each other, each of the first and second battery groups including a plurality of battery cells; a first bus bar assembly disposed on a first side of the first battery group, the first bus bar assembly including a first bus bar electrically connecting the plurality of battery cells of the first battery group; a second bus bar assembly disposed on a firs side of the second battery group, the second bus bar assembly including a second bus bar electrically connecting the plurality of battery cells of the second battery group; and a sensing unit electrically connected to both the first bus bar and the second bus bar and configured to measure states of the plurality of battery cells.