A dustbin has a main lid pivoted thereto, a second lid slidable on the main lid for covering an opening of the main lid with, a pedal, and a tube having a slide movably confined therein; a first rope is connected to the pedal and the slide while a second rope is connected to the slide and the second lid such that the second lid will be opened immediately after the pedal is depressed; a third rope is connected to the main lid at upper end, and passed through the slide, and has a block connected to the lower end, which is a distance away from the slide before the pedal is depressed; thus, the main lid will be opened by pulling the third rope downwards, and the third rope won't be pulled until the pedal is depressed to such a position that the slide contacts the block to make the block move.