PIPE CONNECTION STRUCTURE OF FUEL CELL

PROBLEM TO BE SOLVED: To provide a pipe connection structure of a fuel cell which can restrain leakage of gas when overheated. SOLUTION: In this pipe connection structure of the fuel cell, by inserting an oxidant gas outlet metal pipe 30 into the inside of an oxidant gas discharge ceramic pipe 26 for passing oxidant gas 2 fed for power generation at a stack 18, and by thermally expanding the oxidant gas outlet pipe 30, these pipes 26, 30 are connected together. In this case, a connection member which inserts one end of a second ceramic joint pipe 37 into the inside of one end of a first metal joint pipe 36 is provided, and the connection member intervenes between the oxidant gas discharge pipe 26 and the oxidant gas outlet pipe 30 so that the other end of the first joint pipe 36 is inserted into the inside of the oxidant gas discharge pipe 26, and so that the other end of the second joint pipe 37 is engaged with the outer peripheral surface of the oxidant gas outlet pipe 30.