A slide rail assembly includes a first rail, a second rail, a contact structure and a locking device. The second rail is movable relative to the first rail. The contact structure is arranged on the second rail. The locking device is arranged on the first rail and includes a working member configured to be in a blocking state or an unblocking state relative to the first rail. When the second rail is located at a retracted position and when the working member is in the blocking state, the working member is configured to block the contact structure, in order to prevent the second rail from being moved relative to the first rail from the retracted position along an opening direction.