A slide rail assembly includes a first rail, a second rail, a bracket base, a supporting base, and a contact member. The second rail is movably connected to, and longitudinally displaceable relative to, the first rail. The bracket base is connected to the first rail. The supporting base is movably mounted to the bracket base. The contact member is fixedly attached to the second rail and has a contact portion. The supporting base has a first feature corresponding to the contact portion of the contact member. When the second rail is pulled out relative to the first rail, the supporting base is displaced by the contact member so as to support the second rail.