NOVELTY - A hydrogen-producing apparatus (1) comprises reaction chamber (2) for mixing hydrogen-producing solution and reaction promotion solution, hydrogen-producing solution supply flow channel (5) which introduces hydrogen-producing solution into reaction chamber, reaction promotion solution supply flow channel (6) which introduces reaction promotion solution into reaction chamber, hydrogen flow channel (11) which discharges hydrogen from reaction chamber, and solution discharge flow path (7) which discharges reaction indoor solution.    USE - A hydrogen-producing apparatus for fuel cell (claimed).    ADVANTAGE - The hydrogen-producing apparatus has a simple structure and can perform stable production of hydrogen, without requiring large-scale mechanism. Size of hydrogen-producing apparatus, and fuel cell can be reduced in size.    DETAILED DESCRIPTION - A hydrogen-producing apparatus (1) comprises reaction chamber (2) for mixing hydrogen-producing solution and reaction promotion solution, hydrogen-producing solution supply flow channel (5) which introduces hydrogen-producing solution into reaction chamber, reaction promotion solution supply flow channel (6) which introduces reaction promotion solution into reaction chamber, hydrogen flow channel (11) which discharges hydrogen from reaction chamber, and solution discharge flow path (7) which discharges reaction indoor solution, solution produced after reaction of hydrogen-producing solution extruded from reaction chamber and reaction promotion solution, according to force of volume expansion based on production of hydrogen in reaction chamber. An INDEPENDENT CLAIM is included for fuel cell.    DESCRIPTION OF DRAWING(S) - The drawings show block diagrams of the hydrogen-producing apparatus.    Hydrogen-producing apparatus (1)    Reaction chamber (2)    Hydrogen-producing solution supply flow channel (5)    Reaction promotion solution supply flow channel (6)    Solution discharge flow path (7)    Hydrogen flow channel (11)