A battery packaging material having excellent long-term adhesion of a barrier layer having an acid resistance film. The battery packaging material includes a laminate including at least a base material layer, a barrier layer, and a heat-sealable resin layer in this order, wherein the battery packaging material includes an acid resistance film on at least one surface of the barrier layer, and when the acid resistance film is analyzed using time-of-flight secondary ion mass spectrometry, a PPO3/CrPO4 ratio, which is the ratio of peak intensity PPO3 derived from PO3− to peak intensity PCrPO4 derived from CrPO4−, falls within a range of 6 to 120.