A case includes a cover, a bezel and a locking member. The cover includes a positioning portion and a plurality of mounting holes. The bezel includes a plurality of engaging portions located on the inner surface of the bezel. The engaging portions pass through the mounting holes. The locking member is slidably attached to the cover. The locking member includes a latching portion engaging with the engaging portion and a resilient portion resisting the positioning portion. The resilient portion is detached from the positioning portion by deformation of the resilient portion.