FUEL CELL STACK

An embodiment of the present disclosure relates to a fuel cell stack including a membrane electrode assembly (MEA), a first separator stacked on the MEA and including a reaction channel disposed on one surface of the first separator facing the MEA and configured to allow a reactant gas to flow therethrough, and a cooling channel disposed on the other surface of the first separator and configured to allow a cooling gas to flow therethrough, and inclined guide holes formed through the first separator and inclined with respect to a thickness direction of the first separator, the inclined guide holes each having one end communicating with the cooling channel, and the other end communicating with the reaction channel, thereby obtaining an advantageous effect of improving performance and operational efficiency.