This device for supplying highly concentrated hydrogen gas for biological applications comprises: an electrolysis tank having an electrolysis chamber into which the water to be electrolyzed is introduced, one or more membranes which separate the inside and outside of the electrolysis chamber, and at least one pair of electrode plates which are provided respectively to the inside and outside of the electrolysis chamber, with the membrane interposed therebetween, the electrode plate on the outside of the electrolysis chamber being in contact with the membrane a DC power supply that applies a DC voltage to the pair of electrode plates a means of supplying gas for dilution, for diluting hydrogen gas generated from the electrode plate which serves as an anode. At least part of the gas layer that is formed in the electrolysis chamber is covered by a hydrogen gas permeable membrane, and by blowing gas for dilution, which is supplied using the means for supplying gas for dilution, to the anode or the anode water surface, the concentration of hydrogen gas at a position 7cm distant from the anode or the anode water surface during electrolysis is maintained constantly below 18.3vol.%, thereby ensuring the supply of a mixed gas containing hydrogen gas and a gas for dilution, having a concentration of hydrogen gas of at least 0.1vol% but less than 18.3vol%.La présente invention concerne un dispositif pour la fourniture de gaz hydrogène hautement concentré pour des applications biologiques comportant : une cuve délectrolyse comprenant une chambre délectrolyse dans laquelle leau à être électrolysée est introduite, et une ou des membrane(s) qui sépare(nt) lintérieur de lextérieur de la chambre délectrolyse, et au moins une paire de plaques délectrode qui sont prévues respectivement à lintérieur et à lextérieur de la chambre délectrolyse, la membrane étant interposée entre celles-ci, la plaque délectrode à lextérieur de la chambre délectrolyse étant en contact avec la membrane une
