In the hydrogen generator that the bath that [project] is immersed in generation hydrogen water in the aqueous solution of citric acid to the reacting metal body core of magnesium and its alloy is used and drunk, according to immersion, above-mentioned reacting metal body core contacts container bottom, surface area, which is reduced, provides the deterioration of the circulation to few and above-mentioned water-soluble liquid, is able to carry out the setting method for the above-mentioned reacting metal core that stable hydrogen generates. [solution] upward jade foot 4 is arranged in reaction container bottom 2, makes the center for respectively entering the meat thickness in the continuous cutting-off face of above-mentioned reacting metal body core 6. [selection figure] Fig. 1
