Fuel cell stack for vehicle

A unit cell (12) includes a membrane electrode assembly (14), and first and second separators (16, 18) for sandwiching the membrane electrode assembly (14). The membrane electrode assembly (14) includes an anode (28) and a cathode (30) having a substantially square shape having a side length L1 in a range of 140 mm to 200 mm. The first and second separators (16, 18) have a substantially square shape having a side length L2 in a range of 200 mm to 300 mm.