FUEL REFORMING DEVICE

PROBLEM TO BE SOLVED: To be compatible with a compact of a whole device and an enhancement of a CO removing performance. SOLUTION: Not only a cooling function of a reformed gas but also a stirring function of the reformed gas and an air for oxidizing CO are imparted to a heat exchanger 26. Namely, the reformed gas and the air are mixed by feeding the air from the outside to the sheet tube type heat exchanger 26 of three path system. An air-feeding position is made to a bent portion 32a of a first flow passage such that the mixed air is carried at least once by way of the bent portion of the flow passage. Thereby, the mixed air of the reformed gas and the air is mixed when it changes a flowing direction at a bent portion 32b of a second flow passage and a uniform mixing degree can be obtained.