A developing cartridge comprising: a casing configured to accommodate therein developing agent; a lever movable relative to the casing between a first position and a second position, the lever being positioned at an outer surface of the casing; a first urging member configured to urge the lever toward the first position; a first gear rotatable about a first axis extending in a first direction, the first gear being positioned at the outer surface of the casing; a second gear rotatable about a second axis extending in the first direction from a first rotational position to a second rotational position and further from the second rotational position to a third rotational position, the second gear being positioned at the outer surface, the second gear rotating in accordance with rotation of the first gear in a case where the second gear is in engagement with the first gear; a first protrusion rotatable together with the second gear, the first protrusion having a first contact surface configured to contact the lever; and a second protrusion rotatable together with the second gear, the second protrusion being positioned away from the first protrusion in a rotational direction of the second gear, the second protrusion having a second contact surface extending in the rotational direction, the second contact surface being configured to contact the lever, the developing cartridge is configured such that, in a case where the second gear rotates from the first rotational position to the second rotational position, the first contact surface contacts the lever to move the lever from the first position to the second position against urging force of the first urging member, and then the lever moves at a first speed from the second position to the first position, in a state where the first contact surface contacts the lever, wherein, in a case where the second gear is positioned at the second rotational position, the contact between the first contact surface and the lever is released, wherein, in a case where the second gear rotates from the second rotational position to the third rotational position, the second contact surface contacts the lever to move the lever from the first position to the second position against the urging force of the first urging member, and wherein, in a case where the second gear is positioned at the third rotational position, the contact between the second contact surface and the lever is released, and the lever moves at a second speed higher than the first speed from the second position to the first position by the urging force of the first urging member. a casing configured to accommodate therein developing agent; a lever movable relative to the casing between a first position and a second position, the lever being positioned at an outer surface of the casing; a first urging member configured to urge the lever toward the first position; a first gear rotatable about a first axis extending in a first direction, the first gear being positioned at the outer surface of the casing; a second gear rotatable about a second axis extending in the first direction from a first rotational position to a second rotational position and further from the second rotational position to a third rotational position, the second gear being positioned at the outer surface, the second gear rotating in accordance with rotation of the first gear in a case where the second gear is in engagement with the first gear; a first protrusion rotatable together with the second gear, the first protrusion having a first contact surface configured to contact the lever; and a second protrusion rotatable together with the second gear, the second protrusion being positioned away from the first protrusion in a rotational direction of the second gear, the second protrusion having a second contact surface extending in the rotational direction, the second contact surface being configured to contact the lever, the developing cartridge is configured such that, in a case where the second gear rotates from the first rotational position to the second rotational position, the first contact surface contacts the lever to move the lever from the first position to the second position against urging force of the first urging member, and then the lever moves at a first speed from the second position to the first position, in a state where the first contact surface contacts the lever, wherein, in a case where the second gear is positioned at the second rotational position, the contact between the first contact surface and the lever is released, wherein, in a case where the second gear rotates from the second rotational position to the third rotational position, the second contact surface contacts the lever to move the lever from the first position to the second position against the urging force of the first urging member, and wherein, in a case where the second gear is positioned at the third rotational position, the contact between the second contact surface and the lever is released, and the lever moves at a second speed higher than the first speed from the second position to the first position by the urging force of the first urging member.