A server includes a chassis, at least a partition and at least a server unit. The chassis has an accommodating cavity and a first fixing structure. The partition has a second fixing structure and includes a plate, a pivot component and a locking component. A first space and a second space are defined in the accommodating cavity by the plate. The locking component has at least a first locking portion and a stopping portion. The pivot component is pivoted between the plate and the locking component. When the locking component moves from a first position to a second position, the first locking portion is locked to the chassis and the locking component is positioned by a structural interference between the stopping portion and the chassis. The server unit is fixed in the first space by the first fixing structure or fixed in the second space by the second fixing structure.