An electronic device includes a chassis, a tray, and a securing member. The chassis is configured to hold electronic elements having cables, and includes a rear plate having an outer surface. The tray is attachable to the outer surface of the rear plate, and includes a bottom wall substantially perpendicular to the rear plate of the chassis. The securing member secured on the bottom wall of the tray and includes a latch portion resiliently deformable for maintaining the cables between the latch portion and the bottom wall.