A cell balancing module according to an embodiment of the present invention comprises: a main board on which a plurality of cell balancing resistors are mounted; at least one sub-board on which a plurality of cell balancing resistors are mounted and which is formed above the main board while being spaced a predetermined distance apart therefrom; and at least one connector which supports the sub-board to be spaced apart from the main board and electrically connects the sub-board to the main board.