The hydrogen production apparatus 1; further comprising differential pressure supply means for supplying {HEAD ~ the reaction solution} from {TAIL ~ the reaction solution container} to the reactant container by a pressure difference when an internal pressure of the reactant container lowers compared with an internal pressure of the reaction solution container 
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The hydrogen production apparatus 1 ; further comprising differential pressure supply means for supplying { HEAD ~ the reaction solution } from { TAIL ~ the reaction solution container } to the reactant container by a pressure difference when an internal pressure of the reactant container lowers compared with an internal pressure of the reaction solution container
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