A battery module has a first power generating element (20) and a second power generating element (20) that are electrically connected in series to perform charging and discharging, a case (10) that houses the first power generating element and the second power generating element in a sealed state, a positive electrode terminal (52) that is electrically connected to a positive electrode of the first power generating element, a negative electrode terminal (53) that is electrically connected to a negative terminal of the second power generating element, and a valve (12d) that releases a gas generated in the case to the outside. The positive electrode terminal, the negative electrode terminal, and the case are provided in an installation area of the case that faces a specified direction, and the positive electrode terminal and the negative electrode terminal are disposed in one end side of the installation area while the valve is disposed in the other end side of the installation area.