A server device including a chassis having an accommodating space and an opening, a least one server having a front part and a back part, and at least one connecting rod assembly having a first connecting rod, a second connecting rod, and a third connecting rod. The server may be located in the accommodating space and be drawable from the opening. The first connecting rod is pivoted on the front part of the server. The second connecting rod is pivoted on the back part of the at least one server. An end of the third connecting rod is pivoted on the first connecting rod, and another end of the third connecting rod is pivoted on the second connecting rod. The first connecting rod is rotatable relative to the server to move the third connecting rod, so that the second connecting rod is fastened to the chassis.