To develop a conventional structure of a toner cartridge. Toner cartridge includes a container and an open/close member. The container includes an accommodating portion, a discharge opening and a cartridge side guide. the open/close member includes a closing portion and an engaging portion and is movable between a closing position and an opening position. When the toner cartridge is dismounted from a receiving apparatus, the engaging portion receives a force for moving the open/close member from the opening position toward the closing position, the engaging with a receiving apparatus side guide of the receiving apparatus.