In order to secure a larger cooling surface area for battery cells and making it possible to keep the height of the battery module low and improve the degree of freedom in arranging the battery cells, this battery module is provided with a plurality of battery cells 2 each comprising an all-solid battery having laminated therein a positive electrode layer 201, a negative electrode layer 202, and a solid electrolyte layer 203. Each of the battery cells 2 has a pair of electrode terminals 23a, 23b protruding from opposing lateral faces 22 of the battery cell 2. The plurality of battery cells 2 are arranged so as to be parallel to the lamination planes of the positive electrode layer 201, the negative electrode layer 202, and the solid electrolyte layer 203 and in such a manner as to have the respective electrode terminals 23a, 23b of different battery cells 2 arrayed in parallel to each other. The electrode terminal 23a and the electrode terminal 23b of battery cells 2 adjacent in the array direction are electrically connected by a bus bar 3.