A fuel cell includes a cell side insulation (2) separating an internal space of a pressure vessel (205) into an outer space (5) and an inner space (6), a plurality of cell stacks (101) disposed in the inner space, and a lower damper (11-i). In the cell side insulation, a plurality of lower flow passages (7) which connect a lower portion of the outer space to a lower portion of the inner space and a plurality of upper flow passages (8) which connect an upper portion of the outer space to an upper portion of the inner space are formed. The lower damper adjusts a flow rate of a gas that flows toward the inner space from the outer space via the plurality of lower flow passages and flows toward the outer space from the inner space via the plurality of upper flow passages.
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