PROBLEM TO BE SOLVED: To provide a flame type fuel cell having no output drop caused by oxygen partial pressure on the cathode side, no generation of the diffusion overpotential caused by an air flow in a combustion system, and effectively utilizing exhaust gas. SOLUTION: In the flame type fuel cell using gas fuel, a combustion chamber has a cylindrical shape, the chamber wall in the combustion chamber is regulated by a fuel cell, the chamber wall of the combustion chamber has the composite wall structure of at least two layers having an air guide passage formed between the layers, and air is supplied to the combustion chamber after passed through the air guide passage formed between adjacent walls. COPYRIGHT: (C)2006,JPO&NCIPI