NOVELTY - The apparatus (1) has an electrolysis board (5) by which a pair of electrode plates (500) is arranged on both surfaces of an ion-exchange membrane (510). An electrolytic vessel (6) which stores pure water (13) used for electrolysis is partitioned into a hydrogen gas generation tank and an oxygen gas evolution tank, by the electrolysis board. A hydrogen gas pressurizing unit (7) pressurizes the generated hydrogen gas, such that the level of pure water is raised to a predetermined level or more than that by the restraining pressure.    USE - Table-top-type hydrogen gas generation apparatus. Uses include but are not limited to generation of hydrogen gas used for active-oxygen removal, inhalation treatment of human body, physics and chemistry experiments, clinical testing, general household, etc.    ADVANTAGE - The separate generation of hydrogen and oxygen gases is carried out without mixing hydrogen and oxygen gases, when electricity is supplied to the electrolysis board. The pure water which has moved to the hydrogen gas generation tank by electrophoresis is prevented from overflowing. Increase in inside pressure of oxygen gas evolution tank can be avoided, so that damage to the oxygen gas evolution tank and the electrolysis board is avoided. Even if a circulation pump is not attached to electrolytic vessel, the hydrogen gas can be taken out efficiently from the hydrogen gas generation tank. The exhaust pressure of oxygen gas can be controlled minutely. The back flow of water can be prevented and the water level can be maintained. Malfunctioning of the apparatus is prevented, size reduction is achieved, and portability of the apparatus is achieved.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of the table-top-type hydrogen gas generation apparatus. (Drawing includes non-English language text)    Table-top-type hydrogen gas generation apparatus (1)    Electrolysis board (5)    Electrolytic vessel (6)    Hydrogen gas pressurizing unit (7)    Pure water (13)    Electrode plate (500)    Ion-exchange membrane (510)