A cable management device applicable to a chassis and comprising a first cable management arm, the first cable management arm comprising: a first support arm comprising a front portion, a rear portion, and a first guiding portion located at the front portion of the first support arm; a second support arm comprising a front portion, a rear portion, and a first guiding portion located at the front portion of the second support arm; wherein the first cable management arm further comprises: a first connecting member movably connected between the front portion of the first support arm and the front portion of the second support arm; characterised in that the first connecting member comprises a front guiding portion and a rear guiding portion; wherein the first guiding portion of the first support arm is movable along and relative to the front guiding portion of the first connecting member, and the first guiding portion of the second support arm is movable along and relative to the rear guiding portion of the first connecting member; wherein each of the front guiding portion and the rear guiding portion of the first connecting member is a curved groove or a protruding block, and each of the first guiding portion of the first support arm and the first guiding portion of the second support arm is a protruding block or a curved groove movable only within a limited space defined by a corresponding one of the curved grooves or the protruding blocks, and wherein each of the curved grooves defines a path corresponding to a 90-degree circular arc. a first support arm comprising a front portion, a rear portion, and a first guiding portion located at the front portion of the first support arm; a second support arm comprising a front portion, a rear portion, and a first guiding portion located at the front portion of the second support arm; wherein the first cable management arm further comprises: a first connecting member movably connected between the front portion of the first support arm and the front portion of the second support arm; characterised in that the first connecting member comprises a front guiding portion and a rear guiding portion; wherein the first guiding portion of the first support arm is movable along and relative to the front guiding portion of the first connecting member, and the first guiding portion of the second support arm is movable along and relative to the rear guiding portion of the first connecting member; wherein each of the front guiding portion and the rear guiding portion of the first connecting member is a curved groove or a protruding block, and each of the first guiding portion of the first support arm and the first guiding portion of the second support arm is a protruding block or a curved groove movable only within a limited space defined by a corresponding one of the curved grooves or the protruding blocks, and wherein each of the curved grooves defines a path corresponding to a 90-degree circular arc. a first connecting member movably connected between the front portion of the first support arm and the front portion of the second support arm; characterised in that the first connecting member comprises a front guiding portion and a rear guiding portion; wherein the first guiding portion of the first support arm is movable along and relative to the front guiding portion of the first connecting member, and the first guiding portion of the second support arm is movable along and relative to the rear guiding portion of the first connecting member; wherein each of the front guiding portion and the rear guiding portion of the first connecting member is a curved groove or a protruding block, and each of the first guiding portion of the first support arm and the first guiding portion of the second support arm is a protruding block or a curved groove movable only within a limited space defined by a corresponding one of the curved grooves or the protruding blocks, and wherein each of the curved grooves defines a path corresponding to a 90-degree circular arc.