MEMBER-JOINED STRUCTURE, BATTERY MODULE, AND BATTERY PACK

A member-joined structure includes: a first member, and a second member having a shape of plate, the second member including an overlapping portion that overlaps with the first member and a protruding portion that protrudes from the overlapping portion along a first direction. In the overlapping portion, a joined portion in which the first member and the second member are joined to each other by welding or fusing is formed. The joined portion is provided with a notch portion located opposite to the protruding portion.