To enhance sealing durability by enhancing adhesion durability between a gasket body 1 and a substrate 3 in a substrate-integrated gasket integrated with the substrate 3 such as a separator of a fuel cell with an adhesive.

The adhesive 20 is applied to the surface of the substrate 3 in the width W2 wider than the width W1 of a bottom surface 11a of the gasket body 1, the bottom surface 11a is pressed against the applied adhesive 20, or a rounded part or a chamfer is formed in both end corner parts in the bottom surface 11a of the gasket body 1, the adhesive 20 is applied to the surface of the substrate 3 or to the bottom surface 11a of the gasket body 1, the bottom surface 11a is pressed against the substrate 3 through the adhesive 20, and a part 21 of the adhesive 20 is overflowed to the both sides of the bottom surface 11a.