A frame assembly includes a frame body and an outer frame. The frame body includes at least one side portion and at least one set of hook structure disposed on the side portion. The hook structure includes a first hook and a second hook. The first hook has a first opening. The second hook has a second opening, and a direction of the second opening is different from a direction of the first opening. The outer frame includes at least one frame unit and at least one fixing structure disposed on the frame unit. The frame unit is corresponding to the side portion of the frame body. The fixing structure is corresponding to the hook structure, and the first hook and the second hook of the hook structure are engaged with the corresponded fixing structure.