A developing cartridge comprising: a casing configured to accommodate therein developing agent; a developing roller rotatable about a first axis extending in a first direction, the developing roller being positioned at one end portion of the casing defined in a second direction; a storage medium including an electric contact surface; a holder (52, 52A) positioned at one end of the casing in the first direction, and movable relative to the casing between a first position and a second position in a third direction crossing the electric contact surface, the holder having one end portion in the third direction, the one end portion holding the electric contact surface; a first lever (53, 53A, 53C) positioned at the one end of the casing in the first direction, and movable relative to the casing between a third position and a fourth position about a second axis (152, 152A, 152B) extending in the first direction; and a second lever (54, 54A, 54B, 54C, 54D) movable together with the holder relative to the casing, the second lever being movable between a fifth position and a sixth position relative to the first lever; wherein the holder is at the first position in a case where the second lever is at the fifth position, and wherein the holder is at the second position in a case where the second lever is at the sixth position; wherein, in a case where the second lever (54, 54A, 54B, 54C, 54D) is at the fifth position, a length in the third direction, between the electric contact surface and one of a pair of opposite end portions of the second lever in the third direction that is farther away from the electric contact surface than a remaining one of the pair of opposite end portions is from the electric contact surface, is a first length (dl), wherein, in a case where the second lever is at the sixth position, a length in the third direction, between the electric contact surface and one of a pair of opposite end portions of the second lever in the third direction that is farther away from the electric contact surface than a remaining one of the pair of opposite end portions is from the electric contact surface, is a second length, and characterized in that the second length is greater than the first length. a casing configured to accommodate therein developing agent; a developing roller rotatable about a first axis extending in a first direction, the developing roller being positioned at one end portion of the casing defined in a second direction; a storage medium including an electric contact surface; a holder (52, 52A) positioned at one end of the casing in the first direction, and movable relative to the casing between a first position and a second position in a third direction crossing the electric contact surface, the holder having one end portion in the third direction, the one end portion holding the electric contact surface; a first lever (53, 53A, 53C) positioned at the one end of the casing in the first direction, and movable relative to the casing between a third position and a fourth position about a second axis (152, 152A, 152B) extending in the first direction; and a second lever (54, 54A, 54B, 54C, 54D) movable together with the holder relative to the casing, the second lever being movable between a fifth position and a sixth position relative to the first lever; wherein the holder is at the first position in a case where the second lever is at the fifth position, and wherein the holder is at the second position in a case where the second lever is at the sixth position; wherein, in a case where the second lever (54, 54A, 54B, 54C, 54D) is at the fifth position, a length in the third direction, between the electric contact surface and one of a pair of opposite end portions of the second lever in the third direction that is farther away from the electric contact surface than a remaining one of the pair of opposite end portions is from the electric contact surface, is a first length (dl), wherein, in a case where the second lever is at the sixth position, a length in the third direction, between the electric contact surface and one of a pair of opposite end portions of the second lever in the third direction that is farther away from the electric contact surface than a remaining one of the pair of opposite end portions is from the electric contact surface, is a second length, and characterized in that the second length is greater than the first length.