To provide a corrugated flexible tube superior in proof compressive load such as earth pressure generated in being buried in the ground and flattening performance, and capable of minimizing strength reduction of an angular part, and further keeping parallel converging attitude in parallel converging arrangement.

This corrugated flexible tube is composed of an inner tube and an outer tube. The outer tube defines an arrangement flat part defining a space between a withstand load part formed by being closely kept into contact with the inner tube, and the inner tube. The arrangement flat parts are arranged every waveform of three pitches constituting the withstand load part. The heights of the withstand load part and the arrangement flat parts are determined to be same as each other.