The power storage device structure according to the present invention includes a power storage device and a casing that encloses the power storage device with a gap therebetween, and has a structure in which a molded body containing an acrylic resin or a molded body containing a copolymer of a monomer used for polymerization of an acrylic resin and another monomer is placed in the gap between the power storage device and the casing. The molded body is preferably in the form of a film, sheet, or plate. With such a power storage device structure, it is possible to reduce the risk of ignition in the event of an abnormality such as damage to a power storage device, particularly to a power storage device stack in which multiple power storage devices are stacked, or overcharge.