High-pressure hydrogen producing apparatus

A high-pressure hydrogen producing apparatus for electrolyzing water supplied to an anode side to generate oxygen on the anode side and hydrogen with a pressure higher than a pressure of the oxygen on a cathode side, comprising:

• a first cell device having a plurality of first unit cells stacked in a gravitational direction;
• a second cell device coupled to a lower end of the first cell device in the gravitational direction and having a plurality of second unit cells stacked in the gravitational direction;
• the first cell device serving as a water electrolysis cell to electrolyze the water, the first cell device including an electrolyte membrane, an anode electrode catalyst layer and an anode current collector provided on a first surface of the electrolyte membrane, and a cathode electrode catalyst layer and a cathode current collector provided on a second surface of the electrolyte membrane, the second surface being provided on an opposite side of the electrolyte membrane to the first surface in the first cell device;
• and
• the second cell device serving as a water permeation cell to cause moisture on the cathode side to permeate toward the anode side, the second cell device including an electrolyte membrane, an anode current collector provided on a first surface of the electrolyte membrane of the second cell device, and a cathode current collector provided on a second surface of the electrolyte membrane of the second cell device, the second surface being provided on an opposite side of the electrolyte membrane to the first surface in the second cell device.