The present invention relates to a compact air cleaner which includes: an external case having an air inlet through which air is introduced an interchangable filter module having a filter for filtering the air introduced through the air inlet and interchangeably arranged inside the external case a filter guide unit having a plurality of sterilization LEDs for sterilizing bacteria on the filter and arranged within the interchangeable filter module and a module cap having an air outlet through which the air filtered through the filter is discharged and detachably coupled to one side of the interchangeable filter module.
