A gasket for a fuel battery provided in a fuel battery cell in which an intermediate part including a MEA is interposed between a pair of separators (52, 53), the gasket for the fuel battery comprising: a gasket main body which is provided with a flat plate shaped gasket base portion retainable by one separator of the pair of separators, and a gasket main body which is provided with a flat plate shaped gasket base portion retainable by the other separator of the pair of separators, the gasket main bodies being adapted to come into contact with the MEA of the intermediate part at positions where the gasket main bodies overlap planarly; and bank portions (24, 34) for fixed size stop according to a gasket thickness, the bank portions being integrally formed in both sides or one side in a width direction of both the gasket main bodies (21, 31), the bank portions (24, 34) being adapted to come into contact with the MEA in the intermediate part, respectively at the positions where they overlap planarly when being fastened to the fuel battery cell, wherein the bank portions (24, 34) for fixed size stop are supportable by convex portions (57, 58) which are provided in the separators, and wherein the convex portions (57, 58) are capable of being buried in the bank portions (24, 34) for fixed size stop, wherein the one gasket main body of the both gasket main bodies is provided with a lip-shaped contact portion having a chevron cross section integrally formed at the center portion in a width direction of the flat plate shaped gasket base portion and the other gasket main body is provided with a flat surface shaped contact portion integrally formed at the center portion in a width direction of the flat shaped gasket main body, a concave portion is provided between the lip-shaped contact portion and the bank portion for fixed size stop in the one gasket main body, and a concave portion is provided between the flat surface shaped contact portion and the bank portion for fixed size stop in the other gasket main body, wherein a dimensional relationship between thicknesses of the gasket base portion, the flat surface shaped contact portion and the bank portions for fixed size stop is set to t4<t5<t6 on the assumption that the thickness of the gasket base portion is set to t4, the thickness of the flat surface shaped contact portion is set to t5 and the thickness of the bank portions for fixed size stop is set to t6. a gasket main body which is provided with a flat plate shaped gasket base portion retainable by one separator of the pair of separators, and a gasket main body which is provided with a flat plate shaped gasket base portion retainable by the other separator of the pair of separators, the gasket main bodies being adapted to come into contact with the MEA of the intermediate part at positions where the gasket main bodies overlap planarly; and bank portions (24, 34) for fixed size stop according to a gasket thickness, the bank portions being integrally formed in both sides or one side in a width direction of both the gasket main bodies (21, 31), the bank portions (24, 34) being adapted to come into contact with the MEA in the intermediate part, respectively at the positions where they overlap planarly when being fastened to the fuel battery cell, wherein the bank portions (24, 34) for fixed size stop are supportable by convex portions (57, 58) which are provided in the separators, and wherein the convex portions (57, 58) are capable of being buried in the bank portions (24, 34) for fixed size stop, wherein the one gasket main body of the both gasket main bodies is provided with a lip-shaped contact portion having a chevron cross section integrally formed at the center portion in a width direction of the flat plate shaped gasket base portion and the other gasket main body is provided with a flat surface shaped contact portion integrally formed at the center portion in a width direction of the flat shaped gasket main body, a concave portion is provided between the lip-shaped contact portion and the bank portion for fixed size stop in the one gasket main body, and a concave portion is provided between the flat surface shaped contact portion and the bank portion for fixed size stop in the other gasket main body, wherein a dimensional relationship between thicknesses of the gasket base portion, the flat surface shaped contact portion and the bank portions for fixed size stop is set to t4<t5<t6 on the assumption that the thickness of the gasket base portion is set to t4, the thickness of the flat surface shaped contact portion is set to t5 and the thickness of the bank portions for fixed size stop is set to t6.