NOVELTY - An autoxidation heating-type reformer has first order reaction portion (2), second order reaction portion (3) and portion (2), parallely arranged in order along vertical direction from inner radius at concentric circle, inside cylindrical-shaped modification container (1), and de-carbon monoxide section (4) of reformed gas, arranged concentric-circularly on outer side of container. Section (4) has de-carbon monoxide catalyst (18) layer.    USE - For producing hydrogen used as fuel for fuel cell used for electric power generation.    ADVANTAGE - The autoxidation heating-type reformer is compact, and has high thermal efficiency.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) autoxidation heating-type modification method. A mixed gas of raw material fuel in which partial modification is carried out by heat transfer particles by which high temperature is maintained with heat transfer of heat of oxidation-modification reaction and shift reaction, and water vapor is mixed with oxygen mixed gas, which is pre-heated with heat at the time steady operation of de-carbon monoxide apparatus. The obtained gas mixture is supplied to the inside of pipe sequentially equipped with oxidation catalyst, mixed catalyst of modification catalyst and shift catalyst, and reformed gas is obtained; and    (2) method to start the internal heating-type reformer. Oxygen for oxidation reaction and raw material fuel are supplied at the beginning in oxygen introduction path (6) filled with oxidation catalyst. The raw material fuel is oxidized and oxygen with high temperature is obtained. The mixed gas of raw material fuel and water vapor, which has passed through the heat transfer particle layer and modification catalyst layer, is supplied to the second order reaction portion. Temperature rise of the reaction portion is acquired obtaining reformed gas.    DESCRIPTION OF DRAWING(S) - The figure shows a vertical direction sectional view of reformer.    modification container (1)    first order reaction portion (2)    second order reaction portion (3)    de-carbon monoxide section (4)    guidance path of reformed gas (5)    oxygen introduction path (6)    de-carbon monoxide catalyst (18)