To provide a pure hydrogen production device where the filling of hydrogen to FCV(fuel cell vehicle) can be performed while pulsation is removed from pure gaseous hydrogen obtained by a PSA (pressure swing adsorption) apparatus.

The device where a hydrogen-containing reformed gas obtained by reforming fuel containing hydrogen atoms is refined by a pressure swing adsorption method is provided with: (a) a reformer 3 having a reforming catalyst producing hydrogen-rich reformed gas from stream and fuel; (b) a PSA apparatus 7 connected to the downstream of the reformer 3 and refining the reformed gas to obtain pure gaseous hydrogen; (c) a pulsation relaxation hydrogen tank 8 storing the pure gaseous hydrogen with pulsation obtained from the PSA apparatus 7; and (d) a high pressure hydrogen tank 12 connected to the pulsation relaxation hydrogen tank 8. The pulsation relaxation hydrogen tank 8 relaxes the pulsation of the pure gaseous hydrogen discharged from the PSA apparatus 7, and the pure gaseous hydrogen in which the pulsation is relaxed is filled into the high pressure hydrogen tank 12 via a compressor 11.

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