Fuel cell stack

A fuel cell stack, comprising:

• power generation cells configured to generate power using gas and stacked in a vertical direction;
• and
• a discharge passage defining member extending in the vertical direction and having an annular cross-sectional shape, wherein
• each of the power generation cells includes:
• a support frame that supports a membrane electrode assembly;
• and
• two separators that sandwich the support frame,
• each of the power generation cells includes a gas hole, the gas holes of the power generation cells defining a gas manifold which extends in the vertical direction and through which the gas flows,
• part of an upper wall surface of the gas manifold includes a water collection portion configured to collect water from the upper wall surface, and
• the discharge passage defining member is located below the water collection portion of the gas manifold and defines a discharge passage out of which the water dropping from the water collection portion is discharged.