Exterior material for all-solid-state battery, and all-solid-state battery

Provided is an exterior material for an all-solid-state battery, which has good insulating properties even at high temperatures. The present invention is an exterior material for an all-solid-state battery for sealing a solid-state battery main body (5), the exterior material being provided with a base material layer (11), a metal foil layer (12) laminated on the inner surface side of the base material layer (11), and a sealant layer (13) laminated on the inner surface side of the metal foil layer (12). A heat-resistant gas barrier layer (21) made of resin is provided between the metal foil layer (12) and the sealant layer (13), an opening (15) is provided in a portion of the sealant layer (13) corresponding to the solid-state battery main body (5), and the heat-resistant gas barrier layer (21) is disposed in the opening (15) such that the surface thereof is exposed on the inner surface side. 本发明提供即使在高温下也具有良好的绝缘性的全固态电池用外装件。本发明以用于将固态电池主体5封入的全固态电池用外装件作为对象，所述全固态电池用外装件具备基材层11、层叠于基材层11的内表面侧的金属箔层12、和层叠于金属箔层12的内表面侧的