Abstract: A packaging material for cold forming, in particular a packaging material for a battery such as a lithium ion secondary battery or the like, that includes a biaxially-stretched polybutylene terephthalate film ensuring excellent cold-formability without sacrificing acid resistance and moisture-proofing and having excellent moisture-proofing, acid resistance, and cold-formability by utilizing the biaxially-stretched polybutylene terephthalate film as a base layer and/or a barrier material reinforcing layer in a battery case packaging material for cold forming. In the battery case packaging material for cold forming, in which a barrier layer and a sealant layer, or alternatively a base layer, a barrier layer, a barrier material reinforcing layer, and a sealant layer are laminated in order, the biaxially-stretched polybutylene terephthalate film is used as the base layer and/or the barrier material reinforcing layer.