Image forming device and ink sheet cartridge mounted on the image forming device

An ink sheet cartridge 20 includes a cartridge body 30. The cartridge body 30 has a pair of side plates 31a, 31b, a partitioning plate 24, and a cover segment 32 together defining a flame shape with an central open space. When the ink sheet cartridge 20 is accommodated to a facsimile device 1, a thermal head 22 and a platen 17 are positioned at the central open space. Also, the partitioning plate 21 serves as a lower transport chute defining a transport path with an upper chute members 27, so that a recording sheet 4 is transported along the transport path.