A slide rail assembly includes a first rail, a second rail, a working member and a contact feature. The second rail and the first rail are movable relative to each other. The working member is mounted to a connecting part arranged on one of the first rail and the second rail. The contact feature is arranged on the other one of the first rail and the second rail. At least one space is defined between the working member and the connecting part. When the slide rail assembly is in a retracted state, the working member is configured to block the contact feature, in order to prevent the second rail from being moved from a predetermined position along one direction.