A cable management device , the cable management device comprising: a shaft ; a first component comprising a bottom part , a connection part and a wall part , each of the wall part and the connection part is bent relative to the bottom part and forms a predetermined angle in relation to said bottom part ; and a second component comprising a first part and a second part bent relative to the first part , the second component configured to open or close the first component , the second component comprising a second engagement part protruding from the second part and two auxiliary parts protruding from the first part in a protrusion direction substantially identical to a bending direction of the second part , wherein the second component pivots on the connection part of the first component by the shaft ; wherein when the second component closes the first component and the second component , a cable management space is defined by the first component and the second component , and the wall of the first component is engaged between the second engagement part and the two auxiliary parts of the second component ; wherein the wall part of the first component has a first side and a second side , the first side is formed with a first engagement part ; wherein when the second component closes the first component , the second engagement part is engaged with the first engagement part of the first component , and the two auxiliary parts are located adjacent to the second side of the wall of the first component , a first distance (LI) is defined between an auxiliary part and the second side of the wall of the first component , a second distance (L2) is defined between the first engagement part and the second engagement part , the first distance is smaller than the second distance; wherein a space is formed between the two auxiliary parts to accommodate a protruded part of the wall part . a shaft ; a first component comprising a bottom part , a connection part and a wall part , each of the wall part and the connection part is bent relative to the bottom part and forms a predetermined angle in relation to said bottom part ; and a second component comprising a first part and a second part bent relative to the first part , the second component configured to open or close the first component , the second component comprising a second engagement part protruding from the second part and two auxiliary parts protruding from the first part in a protrusion direction substantially identical to a bending direction of the second part , wherein the second component pivots on the connection part of the first component by the shaft ; wherein when the second component closes the first component and the second component , a cable management space is defined by the first component and the second component , and the wall of the first component is engaged between the second engagement part and the two auxiliary parts of the second component ; wherein the wall part of the first component has a first side and a second side , the first side is formed with a first engagement part ; wherein when the second component closes the first component , the second engagement part is engaged with the first engagement part of the first component , and the two auxiliary parts are located adjacent to the second side of the wall of the first component , a first distance (LI) is defined between an auxiliary part and the second side of the wall of the first component , a second distance (L2) is defined between the first engagement part and the second engagement part , the first distance is smaller than the second distance; wherein a space is formed between the two auxiliary parts to accommodate a protruded part of the wall part . <EOS>