A slide rail assembly includes a bracket device, a driving device and a rail member. The bracket device includes a supporting frame, a bracket and a fastening member. The bracket is arranged on the supporting frame. The driving device and the bracket device are movable relative to each other. The rail member and the bracket device are movable relative to each other. When the rail member is moved relative to the bracket device from a first predetermined position along a direction, the rail member is able to drive the driving device to move from a first position to a second position, in order to drive the fastening member to switch from a first state to a second state.