ELECTRICITY STORAGE PACK

Provided is an electricity storage pack with higher safety that suppresses an instantaneous increase in internal pressure inside an electricity storage pack. The electricity storage pack includes: a plurality of electricity storage devices electrically connected to each other; a main body of a sealtype exterior body housing the plurality of electricity storage devices; and an unfolding member configured to increase an internal volume of the exterior body when an internal pressure of the exterior body increases and exceeds a predetermined value.