A cable 11 is installed in a trough body 3. An elastic member 7, which is a cable-pressing member, is provided between a trough lid 5 and the cable 11. One end surface (upper surface) of the elastic member 7 contacts the reverse surface of the trough lid 5. The other end surface (lower surface) of the elastic member 7 is in contact with the upper surface of the cable 11. The elastic member 7 is pressed from the reverse surface of the trough lid 5. As a result, the elastic member 7 presses the cable 11 while elastically deforming. Having the elastic member 7 press the cable 11 causes the elastic member 7 to act as a resistance when the cable 11 is pulled out from one end, making it possible to resist the tensile force acting on the cable 11. Using a foamed plastic body for the elastic member makes it possible to easily secure the trough lid and adjust the pressing force
展开▼