NOVELTY - A flat-type modifier which has structure that laminates plate-like component consisting of thermally conductive materials comprises accommodation space (11,21) where hydrogen is generated from fuel introduced by fuel inlet port (13) from outside, fuel flow path which leads to fuel connection exit which introduces carbon monoxide into fuel cell from fuel inlet port of fuel cell of the surface joined to a fuel cell in which surface similarly contacts a fuel cell to fuel exit (14), and air flow path which reaches air connection inlet port which introduces air into air inlet (15) of fuel cell.    USE - A flat-type modifier for fuel cells (claimed).    ADVANTAGE - The modifier module improves heat conduction effect by directly-contacting to fuel-cell module and in a joint surface. The modifier can be heated according to radiation heating effect with air which has heat energies generated from fuel cell module and fuel gas, and as a result, better thermally-conductive efficiency is achieved. Assemble/disassemble of the structure is convenient, and effect of changing fuel processing amount can be achieved.    DETAILED DESCRIPTION - A flat-type modifier which has structure that laminates plate-like component consisting of thermally conductive materials comprises accommodation space which has catalyst unit formed between laminated plate-like components and where hydrogen is generated from fuel which is introduced by fuel inlet port from outside, fuel flow path which leads to fuel connection exit which introduces carbon monoxide into fuel cell from fuel inlet port of fuel cell of the surface joined to a fuel cell in which surface similarly contacts a fuel cell to the fuel exit which discharges fuel outside, and air flow path which reaches air connection inlet port which introduces air into air inlet of fuel cell provided on the surface joined to the fuel cell from air inlet which introduces air from outside. The modifier has an outer periphery shape which matches outer periphery shape of fuel cell, and junction-separable top surface of the modifier as bonding surface for attachment to surface of fuel cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional diagram of the modifier in the flow state of fuel and air.    Base board (1)    Accommodation space (11,21)    Fuel inlet port (13)    Fuel exit (14)    Air inlet (15)