ELECTRICITY STORAGE DEVICE

An electricity storage device includes: an electrode group including first and second electrodes; a case accommodating the electrode group therein, the case having an opening provided therein; and a sealing body covering the opening of the case. The case includes a tubular part, a curved part connected to one end of the tubular part, and a bottom part closing another end of the tubular part. The curved part includes an opening rim, a crimp part connected to the opening rim, and a groove part connected to the crimp part, the crimp part being located outward from the opening rim along a radial direction of the tubular part, the groove part being recessed to protrude inward in the radial direction of the tubular part and having an annular shape. The sealing body includes: a sealing plate having conductivity; and a gasket having electric insulation, the gasket being compressed between the sealing plate and a portion of the crimp part facing the groove part and between the sealing plate and an inner surface of the groove part. The case is electrically connected to the first electrode. The sealing plate is electrically connected to the second electrode. The opening rim does not contact the gasket.