and the oxidation gas inlet port 24 c of the second separator 24 form a supply passage r 1 for supplying oxidation gas to each power generating cell 12 the oxidation gas outlet port 23 d of the first separator 23 the oxidation gas outlet port 13 d of the frame 13 the oxidation gas outlet port 14 d of the second frame 14 and the oxidation gas outlet port 24 d of the second separator 24 form a discharge passage r 2 for discharging oxidation off gas to each power generating cell 12 oxidation gas that is supplied to the supply passage r 1 from the outside of the fuel battery passes through the gas passage of the second gas passage forming member 22 and is used for generating electricity thereafter the oxidation gas is drawn to the discharge passage r 2 as oxidation off gas the configuration of important part of the preferred embodiment will now be described as shown in fig1 3 and 5 in the outer peripheral portion of the first gas passage forming member 21 projecting portions 25 are formed in edges on the left right and downstream edges with respect to the flowing direction of the gas passage the projecting portions 25 extend outward beyond the outer periphery of the anode side electrode catalyst layer 17 and are overlapped onto flange portion s 1.