Strength member for in-vehicle battery case and mounting structure thereof

The purpose of the present invention is to provide: a strength member for a vehicle-mounted battery case, which protects a battery module against an input load from the outside and fixes the battery module to the battery case, and which has excellent protection effects due to a dispersed load on the battery module; and the miniaturization of the battery case is also effectively realized. The strength member is characterized in that when a battery module is housed in a battery case composed of a frame and a bottom panel disposed at the bottom of the frame and mounted on a vehicle, the strength member is used for fixing and holding the battery module in the battery case. The strength member has a protective member for fixing and holding a battery module, and a pair of end members connected to both ends of the protective member, respectively, the pair of end members being disposed on the inner sides of the left and right side walls of the housing, the protective member being formed by connecting a plurality of p