Power storage device

A power storage device comprising:

• a power storage stack which includes a plurality of power storage cells arranged side by side in a first direction;
• and
• a side wall disposed on a lateral side of the plurality of power storage cells in a second direction orthogonal to both the first direction and a vertical direction,
• each of the plurality of power storage cells including:
• a cell case;
• and
• an external terminal protruding in the second direction from a side surface of the cell case in the second direction,
• the side wall including:
• an opposite portion facing the side surface of the cell case in the second direction;
• and
• a recess formed at a position facing the external terminal in the second direction and recessed from the opposite portion in a direction away from the external terminal,
• a length of the recess in the vertical direction being greater than a length of the external terminal in the vertical direction.