The toner cartridge is provided with: a toner storing container of a rectangular shape having a toner feeding opening in an angular portion thereof; and a stirring conveying member that is rotatably disposed inside the toner storing container in a predetermined rotation direction and that stirs and conveys toner toward the toner feeding opening in the toner storing container. Compression ratio defined by the following equation (1) of the toner stored in the toner storing container is 0.25 to 0.38. Compression ratio=(P−A)/P   (1) (Provided that in the equation (1), P represents a packed bulk density of toner and A represents an aerated bulk density of toner.)