BUSBAR MODULE

To provide a busbar module that can appropriately perform water processing inside. A busbar module includes a busbar connected to a battery cell; a terminal connected to the busbar; and a case including a busbar housing part that houses the busbar and the terminal, and a connection housing part that is disposed to communicate with a lower side of the busbar housing part and houses a connection part between the terminal and the electric wire. The connection housing part is formed to be open downward in a vertical direction in a state of being assembled to the battery cell.