A toner cartridge comprising: a casing extending in a first direction and comprising a first toner chamber providing a first interior space in which toner is accommodatable, the first toner chamber having one end portion in the first direction, the one end portion having a first opening allowing toner accommodated in the first interior space to be discharged therethrough; a toner conveyance unit extending in the first direction and rotatable about a first axis extending in the first direction, the toner conveying unit being configured to convey toner from the first interior space to the first opening; a first cover positioned at the one end portion of the first toner chamber, the first cover covering the first opening, the first cover being movable along with the casing, the first cover having a second opening allowing toner to be discharged therethrough; and a shutter positioned at the one end portion of the first toner chamber and having a third opening, the shutter having a protrusion extending in the first direction, the protrusion being positioned farther from the one end portion of the first toner chamber than the first cover is from the one end portion, wherein the protrusion is positioned with respect to a developing unit, and the casing is pivotally movable along with the first cover between a first position and a second position relative to the developing unit, in a case where the toner cartridge is attached to the developing unit, wherein the shutter closes the second opening in a case where the casing is at the first position, and wherein at least a part of the third opening overlaps with at least a part of the second opening, and the third opening allows toner to be discharged therethrough via the second opening in a case where the casing is at the second position, characterized by a second cover covering at least a part of a distal end portion of the protrusion and rotatably supporting the distal end portion of the protrusion, the second cover having a fourth opening through which at least a portion of the protrusion is exposed, wherein the casing is pivotally movable together with the first cover and the second cover relative to the developing unit between the first position and the second position, in a case where the toner cartridge is attached to the developing unit. a casing extending in a first direction and comprising a first toner chamber providing a first interior space in which toner is accommodatable, the first toner chamber having one end portion in the first direction, the one end portion having a first opening allowing toner accommodated in the first interior space to be discharged therethrough; a toner conveyance unit extending in the first direction and rotatable about a first axis extending in the first direction, the toner conveying unit being configured to convey toner from the first interior space to the first opening; a first cover positioned at the one end portion of the first toner chamber, the first cover covering the first opening, the first cover being movable along with the casing, the first cover having a second opening allowing toner to be discharged therethrough; and a shutter positioned at the one end portion of the first toner chamber and having a third opening, the shutter having a protrusion extending in the first direction, the protrusion being positioned farther from the one end portion of the first toner chamber than the first cover is from the one end portion, wherein the protrusion is positioned with respect to a developing unit, and the casing is pivotally movable along with the first cover between a first position and a second position relative to the developing unit, in a case where the toner cartridge is attached to the developing unit, wherein the shutter closes the second opening in a case where the casing is at the first position, and wherein at least a part of the third opening overlaps with at least a part of the second opening, and the third opening allows toner to be discharged therethrough via the second opening in a case where the casing is at the second position, characterized by a second cover covering at least a part of a distal end portion of the protrusion and rotatably supporting the distal end portion of the protrusion, the second cover having a fourth opening through which at least a portion of the protrusion is exposed, wherein the casing is pivotally movable together with the first cover and the second cover relative to the developing unit between the first position and the second position, in a case where the toner cartridge is attached to the developing unit.