The disclosure relates to an electronic device including a chassis, a mainboard, a tray, a positioning component, and a cage assembly. The mainboard is disposed on the chassis. The tray is disposed on the chassis and located above the mainboard. The positioning component is fixed to the mainboard. The cage assembly includes a cage and a linkage assembly. The cage has a contact portion. The contact portion is disposed on the tray. The linkage assembly, includes an actuating lever and latch. The actuating lever is movably disposed on the cage. The actuating lever and the contact portion are respectively located at two opposite sides of the cage. The latch is connected to the actuating lever and has an engaging portion. The engaging portion is engageable with the positioning component.