A cleaner which removes dirt from an additional cleaning apparatus automatically is provided. The cleaner includes a cleaning apparatus which is removably mounted in the cleaner and is dismounted from the cleaner to perform an additional cleaning operation, and includes a housing to store dirt therein, an outlet through which the dirt stored in the housing is discharged, and a movable cover movable between a closing position to close the outlet and an opening position to open the outlet, a receiving unit for receiving the cleaning apparatus, a conversion unit for converting the movable cover of the cleaning apparatus from the closing position to the opening position, a suction unit for drawing in dirt from a cleaning surface along with air, and a dust-collector which is fluidly connected to the suction unit and the cleaning apparatus to separate dirt from air.