Hydrogen generator

A hydrogen generator, comprising:

• a water tank forming a water chamber therein;
• and
• a water electrolysis cell disposed in said water tank, and including;
• a proton conductive membrane;
• an oxygen generator chamber side separator disposed on one side of said proton conductive membrane, said oxygen generator chamber side separator is formed in a ring shape having an inner peripheral surface and an outer peripheral surface, the inner peripheral surface defining an oxygen generator chamber, said oxygen generator chamber side separator including a communicator passage communicating the oxygen generator chamber with said water chamber, the communicator passage extending from the inner peripheral surface toward the outer peripheral surface to thereby discharge unreacted water and generated oxygen from the oxygen generator chamber;
• a hydrogen generator chamber side separator disposed on another side of said proton conductive membrane, said hydrogen generator chamber side separator is formed in a ring shape having an inner peripheral surface and an outer peripheral surface, the inner peripheral surface defining a hydrogen generator chamber;
• and
• a hydrogen outlet passage including a main outlet passage penetrating through said hydrogen generator chamber side separator in a thickness-wise direction thereof and an auxiliary outlet passage connecting the main outlet passage with said inner peripheral surface of said hydrogen generator chamber side separator to thereby discharge unreacted water and generated hydrogen from said hydrogen generator chamber to the water chamber.