Fuel cell stack

A fuel cell stack, comprising:

• a cell stack body composed of multiple power generation cells stacked in a predetermined direction;
• a first end unit and a second end unit respectively disposed at both ends of the cell stack body in a stacking direction thereof;
• a cooling medium flow path including a cooling medium discharge flow path extending through the cell stack body in the stacking direction of the cell stack body to discharge a cooling medium supplied to the cell stack body to an outside;
• and
• a tube body disposed in the cooling medium discharge flow path to extend in the stacking direction of the cell stack body, having end portions supported by the first end unit and the second end unit, and including an internal passage having openings at both ends,
• wherein the second end unit includes an end portion receiving part for receiving a corresponding end portion of the tube body, and
• the end portion receiving part comprises:
• a first recessed part that is recessed in a direction away from the cell stack body and is open toward the cell stack body, the first recessed part receiving the corresponding end portion of the tube body to be displaceable in the stacking direction of the cell stack body and a direction perpendicular to the stacking direction and provided with a first wall surface that an end surface of the tube body can contact;
• and
• a second recessed part that is recessed from a part of the first wall surface in a same direction as the first recessed part, opens in the first wall surface with an area smaller than an end area of the corresponding end portion of the tube body, and communicates with the internal passage of the tube body.