A fuel cell stack comprising: a plurality of power generating cells (3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H) stacked on one another; a heat exchange unit disposed at at least one of a position between two of the power generating cells (3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H) which are located adjacent to each other and a position outside of one of the plurality of power generating cells (3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H) that is located at an end in a stacking direction of the power generating cells (3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H); a fuel gas supply path (41, 31, 32, 35, 36, 37, 49) for supplying fuel gas to the power generating cells (3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H); and an oxidant gas supply path for supplying oxidant gas to the power generating cells (3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H), wherein the fuel gas supply path (41, 31, 32, 35, 36, 37, 49) includes, in series, a first path passing through the heat exchange unit, a second path passing in parallel through some of the plurality of power generating cells (3A, 3B, 3C, 3D, 3E), and a third path passing in parallel through the remaining power generating cells (3F, 3G, 3H); in the second path, when the power generating cells (3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H) are viewed in a stacking direction thereof, two inlets (51, 53) of the fuel gas in each of the some power generating cells (3A, 3B, 3C, 3D, 3E) are located at a first position and a second position located along one side of each power generating cell (3A, 3B, 3C, 3D, 3E), and one outlet of the fuel gas in each of the some power generating cells (3A, 3B, 3C, 3D, 3E) is located at a third position along another side of each power generating cell (3A, 3B, 3C, 3D, 3E) that is opposite the one side; and in the third path, when the power generating cells (3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H) are viewed in the stacking direction, an inlet of the fuel gas in each of the remaining power generating cells (3F, 3G, 3H) is located at a position coinciding with the third position, and an outlet of the fuel gas in each of the remaining power generating cells (3F, 3G, 3H) is located at a position between the first position and the second position. a plurality of power generating cells (3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H) stacked on one another; a heat exchange unit disposed at at least one of a position between two of the power generating cells (3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H) which are located adjacent to each other and a position outside of one of the plurality of power generating cells (3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H) that is located at an end in a stacking direction of the power generating cells (3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H); a fuel gas supply path (41, 31, 32, 35, 36, 37, 49) for supplying fuel gas to the power generating cells (3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H); and an oxidant gas supply path for supplying oxidant gas to the power generating cells (3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H), wherein the fuel gas supply path (41, 31, 32, 35, 36, 37, 49) includes, in series, a first path passing through the heat exchange unit, a second path passing in parallel through some of the plurality of power generating cells (3A, 3B, 3C, 3D, 3E), and a third path passing in parallel through the remaining power generating cells (3F, 3G, 3H); in the second path, when the power generating cells (3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H) are viewed in a stacking direction thereof, two inlets (51, 53) of the fuel gas in each of the some power generating cells (3A, 3B, 3C, 3D, 3E) are located at a first position and a second position located along one side of each power generating cell (3A, 3B, 3C, 3D, 3E), and one outlet of the fuel gas in each of the some power generating cells (3A, 3B, 3C, 3D, 3E) is located at a third position along another side of each power generating cell (3A, 3B, 3C, 3D, 3E) that is opposite the one side; and in the third path, when the power generating cells (3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H) are viewed in the stacking direction, an inlet of the fuel gas in each of the remaining power generating cells (3F, 3G, 3H) is located at a position coinciding with the third position, and an outlet of the fuel gas in each of the remaining power generating cells (3F, 3G, 3H) is located at a position between the first position and the second position.