A fuel cell includes a cell stack including a plurality of unit cells stacked in a first direction, a first end plate and a second end plate disposed at respective side ends of the cell stack, and an enclosure coupled to at least one of the first end plate or the second end plate to envelop a side portion of the cell stack, wherein an end portion of the enclosure comprises at least one protruding portion protruding toward the end plate to which the enclosure is coupled, among the first end plate and the second end plate, and wherein the end plate coupled to the enclosure comprises at least one receiving recess formed therein to receive the at least one protruding portion.