To improve a problem when a packing box, in which a power storage device is packed, is accommodated in a bigger corrugated board box and is delivered.SOLUTION: A delivery box 3 for a lead battery 1 comprises: a delivery box body 10 made of a corrugated board in which a packing box 2 that packs a lead battery 1 (power storage device) is accommodated, and in which a corner part between a short side wall 16 and a bottom wall (lower side flap 18, 20) is folded, whereby a second regulation part 12 (had hook part) is formed; and a reinforcement member 85 having a flat plate part 86 which is laid below the packing box 2 in the interior of the delivery box body 10, and an extension part 87 which extends upward from a marginal part of the flat plate part 86. A part 87A of the extension part 87 is curved to the short side wall 16 side, and the part 87A curved to the short side wall 16 side of the extension part 87 and the second regulation part 12 are overlapped in top view.SELECTED DRAWING: Figure 7