Hydrogen gas generator

A self-regulating hydrogen gas generator, for a hydrogen fuel cell, comprising:

• a fuel tank, defining an inner space having a designated volume, provided with a hydrogen outlet communicating the inner space;
• a fuel solution, containing a hydrogen storing material, stored in the fuel tank;
• and
• a catalyst contacting the fuel solution for generating hydrogen gas, wherein the catalyst fills a catalytic reactor, provided with a closed portion for interrupting the contact between the catalyst and the fuel solution to stop the generation of hydrogen gas in case that a pressure of the fuel tank increases due to the generation of hydrogen gas by the contact between the catalyst and the fuel solution, and an opened portion contacting the fuel solution for generating hydrogen gas in case that the pressure of the fuel tank decreases due to the use of the generated hydrogen gas by the fuel cell, so that the generation and interruption of hydrogen gas are actively regulated based on the increase and decrease of the pressure of the fuel tank.