Film cartridge, film unit, and layer transfer device

A film cartridge installable into and removable from a layer transfer device for transferring a transfer layer onto an image formed on a sheet, the film cartridge comprising:

• a supply reel including a supply shaft on which a multilayer film including a supported layer with the transfer layer included therein and a supporting layer supporting the supported layer is wound, the supply reel including a supply gear provided at an end in an axial direction of the supply reel;
• a take-up reel including a take-up shaft on which to take up the multilayer film;
• and
• a supply case accommodating the supply reel,
• wherein the multilayer film is wound on the supply shaft in such a manner that the supported layer is in contact with the supply shaft, and the multilayer film is wound on the take-up shaft in such a manner that the supported layer is in contact with the take-up shaft,
• wherein the supply case includes two side walls provided at ends apart from each other in the axial direction, an outer side wall located, apart in the axial direction from one side wall of the two side walls that is closer to the supply gear, to cover at least part of the supply gear from the axial direction, and an outer peripheral wall connecting the one side wall and the outer side wall, and
• wherein the supply gear, of which at least part is located between the one side wall and the outer side wall, is exposed to outside through an opening formed in the outer peripheral wall.