A server chassis includes a tray, two inner rails and two outer rails. The tray includes a bottom plate. Two opposite side walls extend from an edge of the bottom plate. A sliding latch is disposed at an outer side of each of the side walls. Each of the two inner walls is disposed at the outer side of the corresponding one of the two side walls. Each of the inner rails is disposed with a through slot corresponding to the sliding latch. The through slot extends longitudinally along the inner rail. The sliding latch is inserted in the through slot to be movable along the through slot. The two outer rails receive the two inner rails respectively, and each of the inner rails is movable outwardly from one end of the corresponding outer rail.