Battery case

A battery case comprises: a battery tray formed from a resin, having a bottom wall on which batteries are mounted, and a peripheral side wall which surrounds the periphery of the bottom wall; and a battery cover which covers the battery tray. A flange portion is provided on the upper surface of the peripheral side wall; and a metallic housing-shaped frame is provided beside the outer wall of the battery tray. The flange portion and the battery cover are fixed onto the upper surface of the metallic housing-shaped frame by fastening members.