NOVELTY - A fuel cell has electric power generation portion (100), electric power generation contribution substance storage portion (200) with reacting material storage portion (210) and electric power generation contribution substance transport unit (400) with reacting material transport unit (410). The portion (100) is equipped with acid medium and basic medium in which electrodes are arranged.    USE - For electric power generation (claimed).    ADVANTAGE - The fuel cell is simple and enables safe generation of electric power. Stable electromotive force is exhibited.    DETAILED DESCRIPTION - A fuel cell has electric power generation portion (100), electric power generation contribution substance storage portion (200) and electric power generation contribution substance transport unit (400). The portion (100) is equipped with acid medium in which electrode (I) is arranged and basic medium in which electrode (II) is arranged. The acid medium and basic medium are mutually adjoined. The acid medium and/or basic medium contain reacting material. The storage portion (200) is equipped with reacting-material storage portion (210). The transport unit (400) is equipped with reacting-material transport unit (410) which supplies the reacting material from storage portion (210) to portion (100).    An INDEPENDENT CLAIM is included for generation of electric power, which involves mutually adjoining the acid medium and basic medium, supplying reacting material containing crab from storage portion to the acid medium and/or basic medium, carrying out oxidation reaction in acid medium and/or reduction in basic medium, generating electric power and recovering product produced by electric power generation to product recovery portion.    DESCRIPTION OF DRAWING(S) - The figure shows the explanatory drawing of structure of the fuel cell. (Drawing includes non-English language text).    Electric power generation portion (100)    Electric power generation contribution substance storage portion (200)    Reacting material storage portion (210)    Acid medium storage portion (221)    Basic medium storage portion (222)    Product recovery portion (300)    Electric power generation contribution substance transport unit (400)    Reacting material transport unit (410)    Acid medium transport unit (420)    Basic medium transport unit (430)    Product transport unit (500)