A packaging material for batteries, which has high puncture strength, while having excellent moldability and electrolyte solution resistance. A packaging material for batteries, which is formed of a laminate that sequentially includes at least a base layer, a stainless steel foil and a thermally fusible resin layer in this order, and wherein an acid-resistant coating film layer is formed on at least the thermally fusible resin layer-side surface of the stainless steel foil.