To provide a piping electric insulation joint of a fuel cell capable of preventing a short circuit due to a scattering of a conductive substance by elongating an insulation length of an inner surface of an insulation gasket separating both flanges from each other and having an excellent electric insulation property and a gas sealing property.

In this piping electric insulation joint of the fuel cell constituted by butting and tightening a first flange 3 and a second flange 4 attached to pipes 1, 2 by bolts across a ringlike electric insulation member 11, inside diameter of the electric insulation member 11 is smaller than inside diameters of both flanges 3, 4 so that the electric insulation member protrudes from inner peripheral faces of the flanges.