A carrier member includes a first section, a second section, and a third section. The first section has a first length. The second section has a second length. The first section, the third section, and the second section connect sequentially and form a U-shaped structure. The first section and the second section have curved sections. The third section has a flat section. When the second section moves relative to the first section, the first section or the second section having the curved section transform into the third section having the flat section and store a resilient recovering force, and the third section having the flat section transforms into the first section or the second section having the curved section for adjusting lengths of the first section and the second section, which prevents a cable disposed on the carrier member from interfering with other mechanism or getting knotted.