Battery case structural body

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.