NOVELTY - The fuel cell system comprises a fuel container, a fuel cell connected to the fuel container, a circulation line connected to the fuel passage, configured to circulate the fuel discharged from an outlet of the fuel passage to the fuel passage, a hydrophilic porous body embedded in the through hole of the hydrophobic porous body, a hydrophobic porous body embedded in the through hole of the hydrophilic porous body, a contact, which penetrates both surfaces of the porous body, a branch passage connected to the first passage, and a tank connected to the branch passage.    USE - The fuel cell system such as direct methanol fuel cell is useful for a compact power supply of a portable instrument.    ADVANTAGE - The fuel cell system can be easily miniaturized by separating the fuel and the gas in an electromotive unit thus reducing the pressure loss on the anode.    DETAILED DESCRIPTION - The fuel cell system comprises a fuel container, a fuel cell connected to the fuel container, a circulation line connected to the fuel passage, configured to circulate the fuel discharged from an outlet of the fuel passage to the fuel passage, a hydrophilic porous body embedded in the through hole of the hydrophobic porous body, a hydrophobic porous body embedded in the through hole of the hydrophilic porous body, a contact, which penetrates both surfaces of the porous body and embedded in the porous body, a branch passage connected to the first passage, a tank connected to the branch passage and configured to contain the fuel in the first passage, a pump configured to supply the fuel in the first passage to the tank or to supply the fuel in the tank to the first passage, a gas supply unit configured to supply a second gas to the gas passage. The fuel cell comprises a membrane electrode assembly including an anode electrode, a cathode electrode and an electrolyte membrane (3), a porous body in contact with the anode electrode, an anode passage plate in contact with the porous body comprising a gas passage collecting a gas generated in the anode electrode and a fuel passage supplying a fuel to the anode electrode, a first seal portion sealing outer circumferences of the cathode electrode, a second seal portion sealing outer circumferences of the anode electrode and a third seal portion sealing the gas passage. The second and the third seal portions are coated with a material comprising lower carbon dioxide gas permeability than that of the first seal portion. The porous body comprises: a hydrophobic porous body comprising a through hole in contact with the fuel passage; and a hydrophilic porous body comprising a through hole in contact with the gas passage. The fuel passage comprises a first passage in contact with the porous body, and a second passage connected to the first passage, in which the second passage has greater fluid diffusion resistance than the first passage.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram illustrating a fuel cell.    Anode catalyst layer (1)    Cathode catalyst layer (2)    Electrolyte membrane (3)    Anode gas diffusion layer (4)    Cathode gas diffusion layer (5)    Carbon-made anode microporous layer. (6)