FUEL-CELL SINGLE CELL

A fuel-cell single cell (C) for sandwiching a membrane/electrode assembly (1) between a pair of separators (2), and equipped with sealing members (S1, S2) for sealing gas channels (GC, GA) formed between the membrane/electrode assembly (1) and each of the separators (2), wherein: the section of the separators (2) in which the sealing material is located is configured so as to provide a sealing-material deposit (2A) for depositing the sealing material (S1, S2) on the reactive-gas receiving-pressure side; and sealing performance is improved as a result of the pressure from the reactive gas acting on the end sections of the sealing material (S1, S2) for forming the sealing-material deposit (2A), and the sealing material (S1, S2) tightly adhering to the separators (2) and the membrane/electrode assembly (1).