A cable trough for corners, comprising: a male trough body including a first bottom wall, a pair of first side walls, and male joints including side beams protruding externally from both edges of an external face of each of the first side walls, a female trough body including a second bottom wall, a pair of second side walls, and female joints including side grooves into which the side beams are fitted, respectively, at both edges of an inner face of each of the second side walls, wherein the male trough body and the female trough body are alternatingly coupled to each other by connecting the male joints with the female joints, when one of the first side walls moves to an interior of the female trough body at an angle to the second side walls, a movement of at least one of the side beams of another of the first side walls is restricted by at least one of the side grooves into which the at least one of the side beams is fitted, the another of the first side walls moving relative to the one of the first side walls, when the another of the first side walls moves to the interior of the female trough body at an angle to the second side walls, a movement of at least one of the side beams of the one of the first side walls is restricted by at least one of the side grooves into which the at least one of the side beams is fitted, the one of the first side walls moving relative to the another of the first side walls, and the male trough body and the female trough body are coupled such that an orientation of the male trough body and an orientation of the female trough body are variable relative to each other, the cable trough is characterized by: a first lid disposed across the pair of first side walls on the male trough body; and a second lid disposed across the pair of second side walls on the female trough body, wherein the first bottom wall has a lower face having bottom protrusions protruding downward from both edges of the lower face, and the second bottom wall of the female trough body has an upper face having a bottom depression into which the bottom protrusions are inserted, and the first lid has an upper face having lid protrusions protruding upward from both edges of the upper face, and the second lid has a lower face having a lid depression into which the lid protrusions are inserted, and the bottom protrusions are movably inserted into the bottom depression, and the lid protrusions are movably inserted into the lid depression. a male trough body including a first bottom wall, a pair of first side walls, and male joints including side beams protruding externally from both edges of an external face of each of the first side walls, a female trough body including a second bottom wall, a pair of second side walls, and female joints including side grooves into which the side beams are fitted, respectively, at both edges of an inner face of each of the second side walls, wherein the male trough body and the female trough body are alternatingly coupled to each other by connecting the male joints with the female joints, when one of the first side walls moves to an interior of the female trough body at an angle to the second side walls, a movement of at least one of the side beams of another of the first side walls is restricted by at least one of the side grooves into which the at least one of the side beams is fitted, the another of the first side walls moving relative to the one of the first side walls, when the another of the first side walls moves to the interior of the female trough body at an angle to the second side walls, a movement of at least one of the side beams of the one of the first side walls is restricted by at least one of the side grooves into which the at least one of the side beams is fitted, the one of the first side walls moving relative to the another of the first side walls, and the male trough body and the female trough body are coupled such that an orientation of the male trough body and an orientation of the female trough body are variable relative to each other, the cable trough is characterized by: a first lid disposed across the pair of first side walls on the male trough body; and a second lid disposed across the pair of second side walls on the female trough body, wherein the first bottom wall has a lower face having bottom protrusions protruding downward from both edges of the lower face, and the second bottom wall of the female trough body has an upper face having a bottom depression into which the bottom protrusions are inserted, and the first lid has an upper face having lid protrusions protruding upward from both edges of the upper face, and the second lid has a lower face having a lid depression into which the lid protrusions are inserted, and the bottom protrusions are movably inserted into the bottom depression, and the lid protrusions are movably inserted into the lid depression.