Second inlet connection flow grooves and second outlet connection flow grooves are formed in a power generation cell. The second inlet connection flow grooves connect a fuel gas supply passage and a fuel gas flow field. The second outlet connection flow grooves connect a fuel gas discharge passage and the fuel gas flow field. The flow channel of the second inlet connection flow grooves diverges multiple times in an area from the fuel gas supply passage to the fuel gas flow field. The flow channel of the second outlet connection flow grooves merges multiple times in an area from the fuel gas flow field to the fuel gas discharge passage. The number of merging in the second outlet connection flow grooves is larger than the number of diverging in the second inlet connection flow grooves.