A cable management device includes a first arm and a first connection element. The first arm has a first end portion and a second end portion. The first connection element is pivotally connected to the second end portion of the first arm. One of the first arm and the first connection element is arranged with an engaging feature, and the other one of the first arm and the first connection element is arranged with a corresponding feature. The engaging feature has a connecting portion, a flexible portion, an engaging portion and a contacting portion. When the first arm pivots relative to the first connection element from a first position to a second position by a predetermined angle, the first arm is capable of being kept at the second position relative to the first connection element by cooperation between the engaging feature and the corresponding feature.