There can be obtained a disk cartridge and its loading method in which, when a disk cartridge is miniaturized, loading recessed portions can easily be secured and mis-loading and mis-insertion of the disk cartridge can be prevented. A disk cartridge in which a disk cartridge 1 has at its left and right side end portions on the insertion side formed a pair of loading recess portions 11a, 11b and one loading recess portion 11b is hidden by a shutter plate 7 which is placed in the closed state.
A disk cartridge loading method in which when the disk cartridge 1 is inserted into a drive apparatus 17, the shutter plate 7 is opened by a shutter lock releasing member 9 of the drive apparatus 17, whereby after one loading recess portion 11b hidden by the shutter plate 17 is exposed, the pair of loading recess portions lla, llb are chucked by chucking rollers 20a, 20b of a loading arm 19 and the disk cartridge 1 is brought to the loading position.