Abstract: Disclosed herein is a battery pack including: a plurality of cylindrical battery cells arranged in a plurality of rows and a plurality of layers; a partition member for partitioning the battery cells; a lower case for supporting the partition member; a main circuit board electrically connected to the battery cells; and a display circuit board disposed on the opposite side of the main circuit board; wherein the partition member is provided with a partition plate, a positioning plate for positioning the main circuit board, the positioning plate being provided on the side, facing the lower case, of the partition plate, and an attaching plate for attaching the display circuit board, the attaching plate being provided on the opposite side of the positioning plate with respect to the partition plate.