This has tubular portion (15) in front-end side outer tube, it is provided with first (8) and is looked like by manipulator and passed through and the second channel (9) is looked like by endoscope and passed through, and there is flexibility, it is to promote endoscope according to movement The first channel (8) extended with a cardinal extremity side tube section (16) is towards base end side end side proximally tubular portion (15) forward, the first channel (8) of its distal openings (20,21), the distal tubu lar portion (15) of front end side is provided with second channel (9), the proximal end of the second channel of the cardinal extremity of opening (22) is provided with front end lateral tubular portion (15), and the first channel on the proximal end of opening (23) is the proximal tubular portion (16) of base end side.
