A computer enclosure includes a chassis having a back plate, a cover having a base plate, and a locking member pivotally positioned on the base plate, and two resilient members attached between the base plate and two ends of the locking member respectively. The locking member defines at least a locking protrusion thereon. The back plate defines a flange thereon for blocking the locking protrusion of the locking member. The locking member is in a first position when the two resilient members are in a normal state, and is in a second position when the two resilient members are resiliently deformed and the locking member rotated to a degree that the flange is free of the locking protrusion. The locking member is capable of rotating to move between the first and second positions. The flange latches the locking protrusion on the chassis, and the cover is attached on the chassis.