PURPOSE: To make a film spool freely rotate independently of coaxially separated disks by rotating two disks with the rotation in the same direction of a spool core part when the spool core part is first rotated in a feeding direction.

CONSTITUTION: This film cassette is constituted so that the spool core part 23 is coaxially and loosely connected to the disks 51 and 53 and, for expanding a film roll 37 in a radial direction, until relations without sliding are established between an outermost winding 47 and annular lips 59 and 61, the first rotation in the feeding direction of the spool core part 23 with respect to the disks 51 and 53 is permitted and, when the spool core part 23 is further rotated in the feeding direction, the disks 51 and 53 are rotated together with the spool core part 23. Thus, the film spool 5 can be freely rotated independently of a pair of the coaxially separated disks 51 and 53.