A connection device for a cable management device and a slide rail assembly is disclosed. The slide rail assembly includes a first rail and a second rail, and the first rail and the second rail are displaceable with respect to each other. The cable management device includes a first arm and a second arm. The first arm and the second arm are movable with respect to each other and respectively coupled to the first rail and the second rail by two connection devices. At least one of the connection devices includes a first fitting, a second fitting and a resilient member. When the first fitting is mounted to the second fitting, a portion of the resilient member is configured to prevent the first and second fittings from being detached from each other.