(Currently amended) A battery pack comprising: one or more electric cells; and a packaging case that houses the one or more electric cells, the packaging case including: a tray on which the electric cells are arranged, the tray having a lower flange portion; a cover that covers the electric cells on the tray, the cover having an upper flange portion, the lower flange portion and the upper flange portion that abut each other with the electric cells on the tray covered with the cover; and an edge cover that covers, from outside, the whole circumference or substantially the whole circumference of the lower flange portion and the upper flange portion abutting each other, the edge cover including: a first section facing the lower flange portion; a second section facing the upper flange portion; and a connecting portion for connecting base ends of the first section and the second section, wherein a plurality of female threaded portions are arranged on either the first section or the second section, and screw insertion holes (H1, H2, H3) for causing male screw members to be inserted according to the arrangement of the female threaded portions are arranged on either the first section or the second section in which the female threaded portions are not arranged, on the lower flange portion, and on the upper flange portion. one or more electric cells; and a packaging case that houses the one or more electric cells, the packaging case including: a tray on which the electric cells are arranged, the tray having a lower flange portion; a cover that covers the electric cells on the tray, the cover having an upper flange portion, the lower flange portion and the upper flange portion that abut each other with the electric cells on the tray covered with the cover; and an edge cover that covers, from outside, the whole circumference or substantially the whole circumference of the lower flange portion and the upper flange portion abutting each other, a tray on which the electric cells are arranged, the tray having a lower flange portion; a cover that covers the electric cells on the tray, the cover having an upper flange portion, the lower flange portion and the upper flange portion that abut each other with the electric cells on the tray covered with the cover; and an edge cover that covers, from outside, the whole circumference or substantially the whole circumference of the lower flange portion and the upper flange portion abutting each other, the edge cover including: a first section facing the lower flange portion; a second section facing the upper flange portion; and a connecting portion for connecting base ends of the first section and the second section, wherein a plurality of female threaded portions are arranged on either the first section or the second section, and screw insertion holes (H1, H2, H3) for causing male screw members to be inserted according to the arrangement of the female threaded portions are arranged on either the first section or the second section in which the female threaded portions are not arranged, on the lower flange portion, and on the upper flange portion. a first section facing the lower flange portion; a second section facing the upper flange portion; and a connecting portion for connecting base ends of the first section and the second section, wherein a plurality of female threaded portions are arranged on either the first section or the second section, and screw insertion holes (H1, H2, H3) for causing male screw members to be inserted according to the arrangement of the female threaded portions are arranged on either the first section or the second section in which the female threaded portions are not arranged, on the lower flange portion, and on the upper flange portion.