A hard disk drive including: a base; a disk pivotally installed in the base to store data; an actuator installed in the base to move a read/write head to a predetermined position of the disk; a cover assembled with the base and having an air hole for making internal/external pressures of the hard disk drive equal to each other; and a breather filter interposed between the cover and the base in order to filter air introduced through the air hole of the cover. An upper portion of the breather filter is tightly coupled to the cover and a lower portion of the breather filter is tightly coupled to the base.