Abstract: A cleaner including a main body; a suction fan in the main body and configured to generate a suction force for sucking in air; a dust collector in the main body and configured to separate foreign substances from the air that was sucked in; a filter housing detachably coupled to a rear of the main body; a filter in the filter housing and configured to filter the air from which foreign substances have been separated by the dust collector; and a controller detachably coupled to a rear of the filter housing, and including a manipulation unit to receive a manipulation input from a user to control an operation of the cleaner and/or an indication unit to display information about an operating state of the cleaner.