Hydrogen production device

A hydrogen production device comprising:

• a first electrode including a conductive substrate and a photocatalytic semiconductor supported on the conductive substrate;
• a second electrode that is electrically connected to the first electrode and disposed in a second region opposite to a first region relative to the first electrode, wherein the first region is defined as a region on a side facing a surface of the first electrode on which the photocatalytic semiconductor is provided;
• a water-containing electrolyte solution in contact with the photocatalytic semiconductor and the second electrode;
• and
• a housing containing the first electrode, the second electrode, and the electrolyte solution, wherein
• the first electrode is provided with a plurality of first through-holes and the second electrode is provided with a plurality of second through-holes, and the first and second through-holes are positioned to form a plurality of communicating holes for allowing the first region and the second region to communicate with each other,
• ion exchange membranes having substantially the same shape as the communicating holes are disposed in the communicating holes to close the communicating holes, and
• a diameter of the first through-holes is smaller than a diameter of the ion exchange membranes.