To perform a high dustproof when a disk drive apparatus records and/or reproduces information signals on a disk shape recording medium, which is stored rotatably within a disk cartridge. The present invention provides a disk drive apparatus for recording and/or reproducing information signals on a disk shape recording medium, which is stored rotatably within a disk cartridge comprising a case having a cartridge storing space in which the disk cartridge is inserted, rotatably driving means for holding the disk shape recording medium, which is stored within the disk cartridge, which is inserted in the cartridge storing space and for rotatably driving the disk shape recording medium, shielding means for defining a shielded space by covering a surrounding area of the rotatably driving means for holding the disk shape recording medium and a filter for removing a dust or the like inside of the cartridge storing space. The shielded space and the cartridge storing space communicate each other via said filter.