NOVELTY - A hydrogen production apparatus contains unit container (3) including electrolysis cell, seal portion which maintains electrolysis cell, and electric power supplying apparatus (12). The electrolysis cell contains introductory hole (22) which is not penetrated into hydrogen-producing pole side (17) and oxygen generation pole side (18). The water vapor is electrolyzed by supplying power in hydrogen-producing pole side to generation hydrogen, and flows out with non decomposed water vapor. Oxygen ion in water vapor is electrolyzed in electrolysis cell to generate oxygen.    USE - Hydrogen production apparatus.    ADVANTAGE - The hydrogen production apparatus has reduced leakage between hydrogen-producing pole side and oxygen generation pole side, and high efficiency.    DETAILED DESCRIPTION - A hydrogen production apparatus contains unit container including electrolysis cell, seal portion which maintains electrolysis cell, and apparatus for supplying electric power to electrolysis cell. The electrolysis cell contains introductory hole which is not penetrated into hydrogen-producing pole side and oxygen generation pole side. The seal portion is isolated from hydrogen-producing pole side and oxygen generation pole side. The hydrogen-producing pole side is supplied with water vapor supply steam (1) as raw material. The oxygen generation pole side is supplied with oxygen gas supply system (7) which supplies oxygen as raw material. The water vapor is electrolyzed by supplying power in hydrogen-producing pole side to generation hydrogen, and flows out with non decomposed water vapor from hydrogen-producing pole outlet (3a). Oxygen ion in water vapor is electrolyzed in electrolysis cell to generate oxygen in oxygen generation pole side, and obtained oxygen flows out through outlet of oxygen generation pole side (3b).    DESCRIPTION OF DRAWING(S) - The drawing shows schematic block diagram of hydrogen production apparatus.    Water vapor supply system (1)    Unit container (3)    Hydrogen-producing pole side outlet (3a)    Outlet of oxygen generation pole side (3b)    Oxygen gas supply system (7)    Electric power supply apparatus (12)    Hydrogen-producing pole (17)    Oxygen producing pole (18)    Introductory hole (22)