Power storage device

A power storage device comprising:

• a case including a cylindrical tube part having an opening end portion at one end thereof, and a bottom part closing another end of the tube part;
• a power storage element disposed in the case and including a pair of electrodes;
• a band-shaped lead connected to one electrode of the pair of electrodes;
• and
• a sealing member sealing the opening end portion of the case, wherein
• the sealing member includes an insulating gasket and a conductive sealing plate,
• the gasket includes a compression part interposed between the tube part and the sealing plate, and a base part disposed between the sealing plate and the power storage element,
• the sealing plate includes a displacement part, and an outer circumferential part provided around the displacement part and held by the compression part,
• the displacement part of the sealing plate and the lead are electrically connected to each other,
• the displacement part is configured to be displaced in a direction away from the lead in response to an increase in an internal pressure of the case, thereby electrically disconnecting the displacement part and the lead from each other, and
• the power storage device further comprises displacement suppressing means disposed in the case and configured to suppress displacement of the lead when the displacement part is displaced in the direction away from the lead.