A manufacturing method of a fuel cell by stacking a plurality of members including gas separators (15, 16) while sequentially engaging the gas separators (15, 16) with a guide section provided in a fuel cell manufacturing apparatus, wherein the guide section comprises a first guide member and a second guide member arranged to be parallel to each other and away from each other in a horizontal direction and to be extended in a stacking direction of the plurality of members including the gas separator (15, 16), the stacking direction being perpendicular to the horizontal direction and a direction of gravity, and each gas separator (15, 16) has a respective first engagement element and a respective second engagement element provided at corresponding positions to the first guide member and the second guide member, each engagement element having a concave and/or convex shape formed along outer periphery of the respective gas separator (15, 16), the manufacturing method comprising: a stacking step of suspending and stacking the plurality of members including the gas separators (15, 16) such that stacking surfaces of the members are parallel to the direction of gravity, through engagement of the gas separators (15, 16) with the fuel cell manufacturing apparatus by engaging the first engagement element with the first guide member and engaging the second engagement element with the second guide member, wherein the plurality of members suspended and stacked such that stacking surfaces of the members are parallel to the direction of gravity by the stacking step satisfy such a configuration that a first support location of the first engagement element and a second support location of the second engagement element respectively supported by the first guide member and the second guide member are arranged at positions away from each other either side of a center of gravity of the gas separator (15, 16) and that the center of gravity is located in a lower area in the direction of gravity below a straight line connecting the first support location with the second support location on a stacking surface of the gas separator (15, 16). a stacking step of suspending and stacking the plurality of members including the gas separators (15, 16) such that stacking surfaces of the members are parallel to the direction of gravity, through engagement of the gas separators (15, 16) with the fuel cell manufacturing apparatus by engaging the first engagement element with the first guide member and engaging the second engagement element with the second guide member, wherein the plurality of members suspended and stacked such that stacking surfaces of the members are parallel to the direction of gravity by the stacking step satisfy such a configuration that a first support location of the first engagement element and a second support location of the second engagement element respectively supported by the first guide member and the second guide member are arranged at positions away from each other either side of a center of gravity of the gas separator (15, 16) and that the center of gravity is located in a lower area in the direction of gravity below a straight line connecting the first support location with the second support location on a stacking surface of the gas separator (15, 16).