Provided is a battery packaging material having an acid-resistant film and having excellent adhesion to a barrier layer. This battery packaging material comprises a laminate having at least a substrate layer, a barrier layer, and a heat-fusible resin layer in this order, wherein an acid-resistant film is provided on at least one surface of the barrier layer, and the ratio of the peak intensity PPO3 derived from PO3 - to the peak intensity PCePO4 derived from CePO4 -, that is, PPO3/CePO4, is within the range of 80-120 when the acid-resistant film is analyzed using time-of-flight secondary ion mass spectrometry.