Adhesive for electrical storage device packaging material, electrical storage device packaging material, electrical storage device container, and electrical storage device

An adhesive for an electrical storage device packaging material containing a polyol compound (A), a polyisocyanate compound (B), and an epoxy resin (C), wherein

• the polyol compound (A) contains an ester bond-containing polyol, wherein the ester bond-containing polyol has an ester bond concentration of 8.5 to 10.5 [mmol/g], and has a weight average molecular weight of 55,000 to 85,000, and
• the following formula is satisfied when a stress at the time when a cured film obtained by curing the adhesive for an electrical storage device packaging material under the condition of 80° C. for 2 weeks is stretched in a stretched state to twice its length at a speed of 6 mm/min under an environment of 20° C. and 65% RH is S1 [N/mm2], and a stress at the time when the cured film is held for 100 seconds in the stretched state is S2 [N/mm2]
• 10.0≤(S1−S2)/S1×100≤40.0. Formula: