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, the first gear including: a first gear portion having an addendum circle; and a second gear portion positioned at a position different from a position of the first gear portion in the first direction, the second gear portion having an addendum circle greater than the addendum circle of the first gear portion; a second gear rotatable about a second axis extending in the first direction, the second gear being positioned at the outer surface, the second gear including: a third gear portion, the third gear portion having an addendum circle; and a fourth gear portion engageable with the second gear portion, the fourth gear portion having an addendum circle smaller than the addendum circle of the third gear portion; and a first protrusion rotatable together with the second gear, the first protrusion contacting the lever to move the lever from the first position to the second position against urging force of the first urging member in a case where the second gear rotates in a state where the second gear portion is in engagement with the fourth gear portion, wherein the second gear is rotatable from a first rotational position to a second rotational position and further from the second rotational position to a third rotational position, wherein, in a case where the second gear rotates from the second rotational position to the third rotational position, the developing cartridge is configured such that the second gear portion engages with the fourth gear portion, and characterized in that the fourth gear portion is positioned at a position different from a position of the third gear portion in the first direction the third gear portion is engageable with the first gear portion, and in a case where the second gear rotates from the first rotational position to the second rotational position, the developing cartridge is configured such that the first gear portion engages with the third gear portion. 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, the first gear including: a first gear portion having an addendum circle; and a second gear portion positioned at a position different from a position of the first gear portion in the first direction, the second gear portion having an addendum circle greater than the addendum circle of the first gear portion; a first gear portion having an addendum circle; and a second gear portion positioned at a position different from a position of the first gear portion in the first direction, the second gear portion having an addendum circle greater than the addendum circle of the first gear portion; a second gear rotatable about a second axis extending in the first direction, the second gear being positioned at the outer surface, the second gear including: a third gear portion, the third gear portion having an addendum circle; and a fourth gear portion engageable with the second gear portion, the fourth gear portion having an addendum circle smaller than the addendum circle of the third gear portion; and a third gear portion, the third gear portion having an addendum circle; and a fourth gear portion engageable with the second gear portion, the fourth gear portion having an addendum circle smaller than the addendum circle of the third gear portion; and a first protrusion rotatable together with the second gear, the first protrusion contacting the lever to move the lever from the first position to the second position against urging force of the first urging member in a case where the second gear rotates in a state where the second gear portion is in engagement with the fourth gear portion, wherein the second gear is rotatable from a first rotational position to a second rotational position and further from the second rotational position to a third rotational position, wherein, in a case where the second gear rotates from the second rotational position to the third rotational position, the developing cartridge is configured such that the second gear portion engages with the fourth gear portion, and characterized in that the fourth gear portion is positioned at a position different from a position of the third gear portion in the first direction the third gear portion is engageable with the first gear portion, and in a case where the second gear rotates from the first rotational position to the second rotational position, the developing cartridge is configured such that the first gear portion engages with the third gear portion.