It is intended to efficiently accomplish stacking of members of high molecular electrolytic type fuel cells. The invention discloses a fuel cell stacking device for conveying stack members to constitute a fuel cell stack and stacking them in a prescribed sequence, comprising a conveying robot, a stacking robot, a guide rail for enabling each robot to move to the stacking position along a prescribed route, a unit for detecting sides and/or apexes of the stack members, and a unit for aligning the positions of the stack members on the basis of the detected information. The invention also discloses a relevant fuel cell stacking method.