NOVELTY - A direct alcohol fuel cell comprises a membrane-electrode assembly having electrodes formed on both faces of an electrolyte membrane; a fuel chamber formed on one electrode; an air chamber formed on other electrode; a fuel tank (1); a supply conduit (3) communicating the fuel tank and the fuel chamber; and a vapor chamber (4) provided on the supply conduit, where the vapor chamber is provided with an oxidation catalyst and an admission port for aspirating emission from the fuel chamber containing the unburned alcohol fuel to the oxidation catalyst.    USE - As a direct alcohol fuel cell, particularly direct methanol fuel cell (DMFC) (claimed) useful as an electric source in a wide range of electrical equipment such as laptop computer, cellular phone, video camera, household equipments and automotive equipments.    ADVANTAGE - In the fuel cell, the liquid alcohol is heated to vaporize in the vapor chamber on the way from the fuel tank to the fuel chamber and supplied to the fuel chamber via the supply conduit, and electricity is generated by an oxidizing reaction through the electrolyte membrane. The electric power thus generated is outputted from the electrodes. In this case, the alcohol fuel is pressurized as a result of being evaporated so that the alcohol fuel can be supplied to the fuel chamber in adequate amounts without using a mechanical pump. Moreover, since the alcohol fuel is evaporated, the alcohol fuel can diffuse easily into the fuel chamber entirely. The evaporated alcohol diffuses all over the surface of the membrane-electrode assembly (MEA) homogeneously. As a result, the MEA functions entirely and efficiently generates electricity. Even if several MEA are laminated, the alcohol vapor can be supplied to the electrode of each layer of the fuel supplying side promptly and efficiently. Therefore, deterioration in generating efficiency can be minimized even if the several MEAs are laminated. No auxiliary equipment such as a pump is especially required for the direct alcohol fuel cell. Therefore, the direct alcohol fuel cell can be downsized entirely. Since the alcohol fuel is supplied to the MEA in vapor phase, the surface of the MEA will not be saturated with liquid. Further, CO2 gas resulting from the reactions in connection with the generation of electricity is allowed to flow smoothly without being hindered, the CO2 can be discharged efficiently from the fuel chamber or the surface of the MEA so that the generating efficiency is improved. By mixing the alcohol vapor with the noncondensable gas, the partial pressure of the alcohol vapor can be lowered. The vaporized alcohol can be promptly and efficiently supplied to the electrode of the fuel supply side, and recondensation of the evaporated alcohol can be prevented.    DETAILED DESCRIPTION - A direct alcohol fuel cell comprises a membrane-electrode assembly having electrodes formed on both faces of an electrolyte membrane; a fuel chamber formed on one electrode; an air chamber formed on other electrode; a fuel tank (1); a supply conduit (3) communicating the fuel tank and the fuel chamber; and a vapor chamber (4) provided on the supply conduit, where the vapor chamber is provided with an oxidation catalyst and an admission port for aspirating emission from the fuel chamber containing the unburned alcohol fuel to the oxidation catalyst. The direct alcohol fuel cell further comprises a noncondensable gas mixing section comprising a noncondensable gas tank; a noncondensable gas supply conduit communicating a supply conduit and the noncondensable gas tank; and a catalyst provided on the noncondensable gas supply conduit.    DESCRIPTION OF DRAWING(S) - The figure shows schematic block diagram of a configuration of direct alcohol fuel cell.    Fuel tank (1)    Generating section (2)    Supply conduit (3)    Vapor chamber (4)    Flow regulating mechanism (5)