OUTER PACKAGE MATERIAL FOR ALL-SOLID-STATE BATTERIES, METHOD FOR PRODUCING SAME AND ALL-SOLID-STATE BATTERY

A outer package material for all-solid-state batteries, said outer package material being composed of a multilayer body that is sequentially provided, from the outer side, with at least a base material layer, a barrier layer and a thermally fusible resin layer in this order, while exhibiting excellent insulating performance in a high temperature environment and excellent followability to the expansion and contraction of a solid electrolyte during charging and discharging of an all-solid-state battery. An outer package material for all-solid-state batteries, said outer package material being composed of a multilayer body that is sequentially provided, from the outer side, with at least a base material layer, a barrier layer and a thermally fusible resin layer in this order, wherein the thermally fusible resin layer is formed of a polybutylene terephthalate film that contains an elastomer.