To provide a connecting method of a corrugated pipe capable of connecting end parts to each other in a state excellent in watertightness regardless of a distance spaced between the end parts of the corrugated pipe.

The connecting method of the corrugated pipe to connect the resin made corrugated pipes 11 to each other by a split coupler 15 is constituted of a process to confront the end parts of the corrugated pipe 11 with each other in a state where they are separated by specified length, a process to inject a putty material 17 by at least more than one round of a trough part of an outer surface of an end part of the opposed corrugated pipe 11, a process to cover a rubber tube 18 for sealing on the putty material and an outer periphery of a crest part of its circumference and a process to make the split coupler 15 firmly in a fastened state by installing the split coupler 15 so that inner surfaces of the end parts make contact with each other on an outer surface of the rubber tube 18.