A slide rail assembly includes a first rail, a second rail and a driving mechanism. The second rail is movable relative to the first rail. The second rail includes an engaging feature. The driving mechanism is arranged on the first rail. The driving mechanism includes a housing, a movable member, an actuating structure and an elastic member. The movable member is movable relative to the housing. The actuating structure is arranged on the movable member. The elastic member is configured to provide an elastic force to the movable member. Wherein, the actuating structure includes a first part and a second part. Wherein, the first part is configured to engage with the engaging feature of the second rail, and the second part is configured to prevent the engaging feature of the second rail from being disengaged from the first part.