NOVELTY - A hydrogen is produced by producing hydrogen gas by chemical reaction of metal ion and reaction water which are eluted from first metal (1) to second substance (2) with larger electronegativity using corrosion effect of oxidation reduction reaction produced by battery formation between first metal where electron is moved and second substance containing carbon.    USE - Production of hydrogen for use as fuels used for hydrogen fueled engine, fuel cell and electric power generating apparatus.    ADVANTAGE - The method is inexpensive, and raises hydrogen gas production efficiency.    DETAILED DESCRIPTION - A hydrogen is produced by maintaining state of second substance (2) having larger electronegativity than first metal (1) which is mutually contacted by immersing solid hydrogen production body in reaction water and reacting, mixing fine particle or grain of carbon and first metal grain with connector material (3) carbonized by heating with container blocking air, using solid hydrogen production body (H) where fine particle or grain of carbon and first metal grain is mutually connected through carbonized connector material (3a), or carbonaceous fine particle or grain and first metal fine particle is directly contacted, and producing hydrogen gas by chemical reaction of metal ion and reaction water which are eluted from first metal to second substance with larger electronegativity using corrosion effect of oxidation reduction reaction produced by battery formation between first metal where electron is moved and second substance containing carbon. The ionization tendency of first metal is larger than hydrogen. The electronegativity of first metal is smaller than hydrogen. An INDEPENDENT CLAIM is included for a solid hydrogen production body.    DESCRIPTION OF DRAWING(S) - The drawing shows a expanded sectional view of the solid hydrogen production body.    First metal (1)    Second substance (2)    Connector material (3)    Carbonized connector material (3a)    Solid hydrogen production body (H)