PACKAGING MATERIAL FOR SOLID-STATE BATTERIES AND SOLID-STATE BATTERY INCLUDING THE PACKAGING MATERIAL

A packaging material for solid-state batteries according to one aspect of the present disclosure contains sulfide-based solid electrolytes, including at least a substrate layer, a barrier layer, and a sealant layer in this order, in which at least one of the layers constituting the packaging material contains a color developer that changes color when reacting with hydrogen sulfide.