A fuel cell stack has a first block having a first number of cells, a first fuel supply channel for supplying fuel gas to the first block, a collecting channel for collecting fuel gas which has passed through the first block, a second block having a second number of cells, the second number being smaller than the first number, a second fuel supply channel for supplying the second block with fuel gas which has been collected into the collecting channel, and a discharge channel for discharging fuel gas which has passed through the second block. A throttling section smaller in channel diameter than first and second fuel gas trunk channels, first and second branch channels, the collecting channel, and the discharge channel is provided downstream of the collecting channel and upstream of the second fuel supply channel.