To provide a cable wiring duct, which is used when erecting a cable for power, communication, or the like embedded in the ground along the outer wall surface of the building and taking the cable into a building through a taking-in window provided on an outer wall surface, capable of being provided in a compact manner to allow wire arrangement in the state where the cable is aligned on the outer wall surface of the building and securing sufficient easiness in cable wiring operation.

A cable wiring duct comprises: a thin box-shaped main body part 1 for wiring on an outer wall surface of a building B in the state where a cable is aligned; and corner parts 2 and 3 for accommodating a curve of the cable into a standing part from the ground in which the cable wiring direction is changed and into a taking-in part into the building B. The corner parts 2 and 3 have tapered parts 21a, 31a, and 31b reducing the volume of projection from the main body part 1, and are fixed to the main body part after the cable wiring.