A cable binding device includes a first binding member including a first binding part binding a circumference of a first cable and a first fastening part connected to the first binding part. The first fastening part is fastened to a fixing hole formed on a panel. The first fastening part is also protruding to the opposite side of the panel. The cable binding device also includes a second binding member including a second binding part binding a second cable on the opposite side of the panel and a second fastening part connected to the second binding part. The second fastening part is fastened to the first fastening part protruding to the opposite side of the panel.