A fuel cell stack includes a plurality of multi-cell modules stacked and a
restraining member. Each multi-cell module includes a plurality of fuel
cells including opposite end fuel cells at opposite ends of the plurality
of fuel cells layered. The restraining member restrains the multi-cell
module in a direction perpendicular to the fuel cell stacking direction
at the opposite end fuel cells of each multi-cell module. Each of the
opposite end fuel cells has an extended portion formed by extending the
opposite end fuel cell outwardly in a direction perpendicular to the fuel
cell stacking direction, and each multi-cell module is restrained by the
restraining member at the extended portion. A hole is formed in the
extended portion and a restraining shaft defining the restraining member
extends through the hole. A deformation preventing member may be disposed
between the extended portions.