An electricity storage device (1) according to an embodiment has a plurality of bipolar electrodes (10), each of which has a positive electrode layer (13) provided on one surface (11a) of a collectorplate (11) and a negative electrode layer (15) provided on the other surface (11b) of the collector plate (11), that are stacked with separators (17) interposed therebetween, wherein the electricity storage device (1) has a plurality of spacers (21), which are disposed along the peripheral edges (11c) of the collector plates (11) between the collector plates (11) adjacent to each other in the stacking direction, and a resin frame (25) for covering the outer periphery (21b) of the plurality of spacers (21).