To provide an air supply device of a fuel cell which supplies uniformly air to respective unit cells for constituting a fuel cell while using a centrifugal fan which does not compress sucked air to a high pressure, which operates stably and efficiently the fuel cell and which reduces a necessary power consumption to drive the air supply device.

The air supply device of the fuel cell supplies the air sucked via the centrifugal fan (air blower 20) to the fuel cell (12) via a manifold (22) which radially enlarges toward a downstream. A plurality of straightening plates (22f) are provided in the manifold (22). The straightening plates (22f) are disposed so that spaced distances of the straightening plates (22f) become larger toward the downstream of the manifold (22), and a straightening unit having a punching plate (22g) is provided at a downstream of the straightening plates (22f).

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