Recording disk cartridge

A recording disk cartridge comprising:

• a plurality of flexible recording disk media;
• a cartridge case for housing the plurality of flexible recording disk media;
• a rotational member for supporting the plurality of flexible recording disk media and causing the plurality of flexible recording disk media to rotate in unison within the cartridge case, the rotational member having axially opposed first and second ends, wherein the cartridge case has an opening to provide access to the first end of the rotational member from outside therethrough;
• a supporting shaft fitted to a portion on an axis of rotation of the rotational member near the second end thereof, the supporting shaft being slidable along the axis of rotation of the rotational member;
• a bearing ball held between an inner surface of the cartridge case and an end of the supporting shaft protruding from a second-end face of the rotational member;
• and
• an elastic member provided between the supporting shaft and the rotational member, the elastic member being stressed to press the rotational member toward the opening of the cartridge case.