Power storage device

A power storage device comprising:

• a power storage module;
• a current collector plate stacked on the power storage module in a first direction, and electrically connected to the power storage module;
• an insulating plate stacked on the current collector plate in the first direction;
• and
• a restraint plate stacked on the insulating plate in the first direction, and applying a restraint load on the power storage module, the current collector plate, and the insulating plate,
• wherein the insulating plate and the restraint plate have different coefficients of thermal expansion,
• wherein the insulating plate has a facing surface facing the restraint plate, and a first protruding portion provided on the facing surface in a position spaced from a center of the facing surface,
• wherein the restraint plate is provided with a first hole portion into which the first protruding portion is inserted,
• wherein the first protruding portion is divided into a first protrusion and a second protrusion in a second direction intersecting the first direction,
• wherein the first protrusion is disposed closer to the center of the facing surface in the second direction, and
• wherein the second protrusion is disposed closer to an outer edge of the facing surface in the second direction.