NOVELTY - Fuel cell, contains structure having positive and negative electrodes opposed through proton conductor, enzyme and mediator immobilized in negative electrode, high outputting agent or mediator diffusion promoter derived from phosphatide and its derivative or polymers in addition to the enzyme.    USE - As electric power generation apparatus.    ADVANTAGE - The enzyme and mediator is uniformly mixed in the fuel cell. The function of mediator can be fully exhibited, and thus high output of the fuel cell is possible.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) manufacturing fuel cell, involves providing structure having positive and negative electrodes opposed through proton conductor, immobilizing enzyme and mediator in negative electrode, and providing high outputting agent or mediator diffusion promoter derived from phosphatide and its derivative or polymers in addition to the enzyme;    (2) negative electrode for fuel cells, comprising high outputting agent or mediated diffusion promoter derived from phosphatide or its derivative or polymers in addition to the enzyme, where the mediator is immobilized on the negative electrode;    (3) manufacturing negative electrode for fuel cell, involves providing high outputting agent or mediated diffusion promoter derived from phosphatide or its derivative or polymers in addition to the enzyme, where the mediator is immobilized on the negative electrode;    (4) electronic device using the fuel cell, comprising structure having positive and negative electrodes opposed through proton conductor, enzyme and mediator immobilized in negative electrode, high outputting agent or mediator diffusion promoter derived from phosphatide and its derivative or polymers in addition to the enzyme;    (5) electrode process utilization apparatus, comprising high outputting agent or mediator diffusion promoter derived from phosphatide or its derivative or polymers in addition to the enzyme, where the mediator is immobilized on the negative electrode;    (6) manufacturing electrode process utilization apparatus, involves providing high outputting agent or mediator diffusion promoter derived from phosphatide or its derivative or polymers in addition to the enzyme, where the mediator is immobilized on the negative electrode;    (7) electrode for electro process utilization apparatus, comprising high outputting agent or mediator diffusion promoter derived from phosphatide or its derivative or polymers in addition to the enzyme, where the mediator is immobilized on the negative electrode;    (8) manufacturing electrode for electrode process utilization apparatus, involves providing high outputting agent or mediator diffusion promoter derived from phosphatide or its derivative or polymers in addition to the enzyme, where the mediator is immobilized on the negative electrode; and    (9) high outputting agent and mediator diffusion promoter, comprising phosphatide or its derivative or polymers.