FUEL BATTERY STACK

A fuel cell stack includes a cell stack body, a terminal plate, an end plate, and a passage portion. The terminal plate is disposed to be adjacent to the cell stack body in a stacking direction and is configured to collect power. The end plate is disposed on a side of the terminal plate that is opposite to the cell stack body. The terminal plate and the end plate have a through-hole that discharges reactant gas from the cell stack body. The passage portion covers an inner peripheral surface of the through-hole. The passage portion includes a peripheral wall that is formed of a plastic having an electrical insulation property and a hydrophilic portion disposed on an inner peripheral surface of the peripheral wall and is made of a plastic having a hydrophilicity higher than that of the plastic forming the peripheral wall.