To provide a corrugated tube and an apparatus for and method of perforating a corrugated tube, which are capable of rapidly discharging water, such as water intruding into the inside and condensation water, to the outside and in which a plurality of communication holes can be positively and efficiently formed respectively in predetermined portions of a peripheral surface of a tube body. For example, a wire harness or the like is inserted into a corrugated tube 10 through a slit 12 formed in a tube body 11 of a tubular shape along a generating line of the tube body, the tube body having larger-diameter portions 20 and smaller-diameter portions 30 which are arranged alternatively along the same axis. Usually, the corrugated tube 10, receiving the wire harness therein, is installed in such a manner that the slit 12 is disposed at a lower side, but there arises the case where the slit 12 can not be disposed at the lower side because of the installation direction and a change of the direction. In such a case, any of communication holes 13 which are formed in that portion of a peripheral surface disposed the remotest from the slit 12, and communicate the inside and outside of the tube body 11 with each other is located at the lower side, so that water intruding into the corrugated tube, condensation water, etc., are discharged.