Battery pack

A battery pack includes core pack housing a plurality of cells, and outer case housing core pack. Outer covering case is formed in a box shape by connecting outer peripheral wall to an outer peripheral edge of a pair of surface plates, and outer peripheral wall provided at each convex corner of each of surface plates include impact-absorbing wall that is an outside surface, main body wall disposed at an inner side of impact-absorbing wall, and impact-absorbing gap separating impact-absorbing wall and main body wall from each other at a predetermined interval. Impact-absorbing gap opens toward surface plates.