PURPOSE: To provide a corrosion resistant flange coupling such that a corrosion resistant core does not fall off even when the corrosion resistant flange coupling is threadedly connected to a connection pipe by firmly integrating a metal flange body and a resin made core in a body.

CONSTITUTION: A corrosion resistant flange coupling, in which a resin made pipe end corrosion resistant core 20 is provided at the screw connecting section of a flange 11, characterized in that the core 20 is firmly fixed to a flange body with a ring-like projection, wherein diameter is smaller than the inner diameter of a female screw, provided in the depth side of the female screw of the flange body 10 for pipe connection and the pipe end corrosion resistant core 20 integrally injection molded from a notch in a gasket side to a female section.