PROBLEM TO BE SOLVED: To provide a supply device of hydrogen gas for a living body, which allows the hydrogen gas beneficial for health to be safely used at a medical site or in a household.SOLUTION: A supply device of hydrogen gas for a living body includes: an electrolytic cell 1 which has an electrolytic chamber 11 to which raw water 12 to be electrolyzed is introduced； at least one diaphragm 13 for sectioning the inside and outside of the electrolytic chamber； and at least a pair of electrode plates 14 and 15 provided in the inside and outside of the electrolytic chamber respectively to sandwich the diaphragm, and in which the outside electrode plate of the electrolytic chamber is brought into contact with the diaphragm； a DC power source 2 for applying a DC voltage to the pair of electrode plates； and a gas-for-dilution supplier 3 for diluting a hydrogen gas generated from the electrode plate to be a negative pole. By blowing a gas for dilution supplied from the gas-for-dilution supplier to the negative pole, a hydrogen gas concentration near the negative pole during electrolysis is maintained to be below 4 vol% at all times, and a mixed gas including the hydrogen gas and the gas for dilution, whose hydrogen gas concentration is 0.1 to 4 vol%, is supplied to the living body.【課題】健康上有益な水素ガスを医療の現場や家庭で安全に使用することができる生体用水素ガス供給装置を提供する。【解決手段】被電解原水１２が導入される電解室１１と、前記電解室の内部と外部とを区画する一つ以上の隔膜１３と、前記電解室の内部及び外部のそれぞれに前記隔膜を挟んで設けられた少なくとも一対の電極板１４，１５と、を有し、前記電解室の外部の電極板が前記隔膜に接触させて設けられている電解槽１と、前記一対の電極板に直流電圧を印加する直流電源２と、陰極となる電極板から発生する水素ガスを希釈するための希釈用ガス供給器３と、を備え、前記希釈用ガス供給器から供給される希釈用ガスを前記陰極に送風することにより、電解時の前記陰極近傍の水素ガス濃度を常に４vol％未満に維持し水素ガス濃度が０．１～４vol％の、水素ガスと希釈用ガスを含む混合ガスを生体に供給する。【選択図】図１
