Disclosed herein is a voltage sensing assembly to detect voltages of battery cells having electrode terminals formed at an upper end or a lower end thereof in a state in which the voltage sensing assembly is mounted to a battery module, the voltage sensing assembly including (a) a block case, formed of an electrically insulative material, mounted to a front or rear of the battery module corresponding to electrode terminal connection parts of the battery cells, (b) conductive sensing parts connected to voltage sensing terminals located at one-side ends of bus bars electrically connected to the electrode terminal connection parts of the battery cells, and (c) a connector to transmit voltages sensed by the conductive sensing parts to a controller, wherein the block case includes mounting grooves, opened to a front, formed at positions of the block case corresponding to the voltage sensing terminals of the bus bars such that the conductive sensing parts are mounted in the mounting grooves, and the conductive sensing parts are connected to the voltage sensing terminals of the bus bars in a state in which the conductive sensing parts are mounted in the mounting grooves of the block case.