FUEL CELL STACK

To provide a fuel cell stack that is not likely to be electrically corroded.SOLUTION: A fuel cell stack, in which a plurality of single cells are stacked in a horizontal direction with a separator interposed therebetween, includes drain tubes for sucking and removing accumulated water that are provided inside at least one of a reaction gas inlet manifold and a reaction gas outlet manifold. The manifold in which the drain tubes are provided is provided on a lower side in a gravity direction in the plane of the separator, an outlet side flow path of the drain tube is connected to a downstream side of a choke portion provided in a drain path through which the reaction gas discharged from the reaction gas outlet manifold flows. The drain tubes include two or more tubes that have different inner diameters and are not communicated with each other, and an upper end of an opening portion of the tube having a smaller inner diameter is located on a lower side in the gravity direction than an upper end of an opening portion of the tube having a larger inner diameter.SELECTED DRAWING: Figure 1 【課題】電食し難い燃料電池スタックを提供する。【解決手段】単セルを、セパレータを介して水平方向に複数個積層した燃料電池スタックであって、反応ガス入口マニホールド、又は、反応ガス出口マニホールドの少なくともいずれか一方のマニホールドの内部に、貯留した水を吸引除去する排水管が設けられ、前記排水管が設けられた前記マニホールドは、前記セパレータの平面内で重力方向の下側に設けられ、前記排水管の出口側流路は前記反応ガス出口マニホールドから排出される前記反応ガスの排出流路に設けられた絞り部の下流側に接続され、前記排水管は異なる内径の２つ以上の連通しない管から構成され、内径のより小さい管の開口部の上端は、内径のより大きい管の開口部の上端よりも重力方向下側にあることを特徴とする。【選択図】図１