A fuel cell assembling apparatus includes: a tensile load application device that pulls a coupling plate to apply a tensile load to the coupling plate of which a first end portion is fixed to a first end plate, the tensile load application device being temporarily fixed to a second end portion of the coupling plate; a compressive load application device that applies a compressive load to a cell stack of a fuel cell; and a fixing device that fixes the second end portion of the coupling plate to which the tensile load is applied, and a second end plate to each other. The tensile load application device applies the tensile load to the coupling plate by using a reaction force generated in response to the compressive load applied to the cell stack by the compressive load application device.