Insulating structure, a fuel cell and a fuel cell stack

Insulating structure comprises a membrane electrode assembly having a frame around, and a pair of separators sandwiching the frame and the membrane electrode assembly, they are the fuel cell stack is formed by laminating a plurality or a fuel cell stack an insulating structure of a fuel cell constituting the. Insulator structure comprises a connecting portion located on at least a part of the outer peripheral portion of the fuel cell stack or fuel cell, it is formed in the connecting portion, and a protruding portion located in the region surrounded by the pair of separators and frame .