Abstract: A fuel cell including a coupling device according to the present invention is configured such that a fastening member for fastening a manifold to a stack is coupled to the manifold in such a manner that the fastening member directly contacts the manifold thus enabling the stack and the manifold to be flexible in reacting to a difference in the thermal deformation between the stack and the manifold, the fastening member having a predetermined cross-sectional area such that the fastening member cannot be easily thermally deformed by an environmental change, thus minimizing a degradation of the binding force of the fastening member.