The present invention provides a battery module capable of securing a connector 
insertion / removal space and suppressing a height dimension.  The battery module includes a 
battery cell stack formed by stacking a plurality of battery cells, a plurality of 
bus bars connecting terminals of adjacent battery cells to each other, and a sensor device that detects the 
voltage of each 
battery cell.  The sensor device is disposed above the plurality of 
bus bars disposed on the upper surface of the 
battery cell stack when viewed in the width direction, and includes a 
voltage detection connector having a connection portion in the width direction.  Each 
bus bar has a bent portion that protrudes upward between the connected battery cells.  The connector for 
voltage detection is disposed between the bent portions of the bus bars adjacent in the stacking direction, and the lower surface of the connector for voltage detection is provided at a position lower than the upper portion of the bent portion in the vertical direction.