An electronic device includes a chassis having two side walls, two data storage devices, two supporting devices, and a bezel. Each side wall defines a lock hole. Each supporting device includes a bracket, a pair of lock pieces, and a pair of connecting members. The bracket includes two opposite side plates each defining a lock opening.Each lock piece includes two clasp members. Each connecting member includes two second poles. The first clasp members extend through the lock openings and insert into the lock holes. The second clasp members of the front supporting device are detachably coupled to the bezel, and the second clasp members of the rear the supporting devices are detachably coupled to the front supporting device. The second poles of the front supporting device are coupled to the bezel, and the second poles of the rear supporting device are coupled to the front supporting device.