Abstract: A battery case structural body includes: two terminal members arranged at both ends of a battery; and a case body that holds the battery. The two terminal members includes two engaging parts, each of which is provided to each terminal member. The case body includes: an accommodating part including a frame and accommodating the battery that is downwardly embedded into the frame from above; two end openings, each of which is formed so as to cut at least upper part of the frame and exposes at least a part of each of the two terminal members arranged at both ends of the battery accommodated in the accommodating part; and two engaged parts engaged with the two engaging parts of the two terminal members.

Abstract: A battery device includes a case and a plurality of batter cells. The case includes a base portion and a cover portion. The base portion includes: a base plate on which the battery cells are placed; a bottom wall portion provided on a side of the base plate, the side being opposite to a surface on which the battery cells are placed, such that the bottom wall portion is provided at a position distanced from the base plate, and a plurality of vertical wall portions having a band-plate shape, the vertical wall portions extending in a predetermined direction between the base plate and the bottom wall portion. The opposite ends of the vertical wall portions in a width direction are connected to the bottom wall portion and the base plate, respectively.