The present disclosure relates to a cleaner including a cleaning module which cleans a cleaning area by generating steam. The cleaning module includes: a cleaning module housing which is connected to the main body, forms an appearance, and forms a space therein; a heater which is disposed within the cleaning module housing and generates steam from water; an air inlet which is formed on one side of the cleaning module housing and into which external air is introduced; and an air outlet which is formed on the cleaning module housing, is disposed above the air inlet, and through which the air in an internal space of the cleaning module is discharged to the outside. As a result, electronic equipment disposed around the heater can be prevented from being damaged by the heat emitted from the heater.