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