Method for manufacturing fuel battery

A method for manufacturing fuel cells, comprising:

• forming an adhesive layer by applying a pressure-sensitive adhesive along a predetermined seal line on a surface of a first separator which constitutes a fuel cell;
• bringing a second separator to the surface of the first separator until the second separator contacts the adhesive layer formed on the first separator, wherein the second separator constitutes another fuel cell;
• bonding the first separator and the second separator together by applying a compressive force to the first separator and the second separator which contact each other via the adhesive layer;
• wherein
• in the bringing a second separator to the surface of the first separator, in a cross-sectional view perpendicular to a longitudinal direction of the seal line, a distance between a surface of the adhesive layer and a surface of the second separator facing the surface of the adhesive layer is minimum at a specific point and increases monotonically from the specific point in a width direction of the seal line.