To provide an insulating pipe for easily preventing corrosion caused by contact with dissimilar metal, and easily securing electric insulating performance between a multi-layer pipe and a metallic joint, in the insulating pipe for fixing the metallic joint to one end of the multi-layer pipe.

For providing the insulating pipe 50A for fixing the metallic joint 30 to one end of the multi-layer pipe 10, a metallic sleeve 20 forming a flange part 20a on one end is installed in the multi-layer pipe. A clearance is formed between one end surface 10a of the multi-layer pipe and a stopper surface 27a arranged on the flange part and the metallic joint, and a metallic layer 3 exposed to the one end surface of the multi-layer pipe is covered with a first electric insulating high polymer material layer 40A, and the clearance is filled with the first electric insulating high polymer material layer.