An ink sheet cartridge provided with a bobbin case easy to assemble and disassemble, formed with no protrusion on the outer surface thereof and capable of inhibiting the number of components from increase is obtained. This ink sheet cartridge is provided with a pawl and a receiving portion on upper and lower components respectively. The pawl is provided with a projecting engaging portion, and the receiving portion is provided with a groove engaging with the engaging portion. The groove has a guide for guiding the engaging portion and a stop portion fixing the engaging portion.