A cartridge comprising: a housing configured to accommodate developer therein and having a first wall and a second wall opposing each other in a first direction defined as a direction from the second wall toward the first wall; a drive-transmission member provided on the first wall and configured to rotate about a first axis parallel to the first direction for transmitting a drive force; and a detected body (72, 72A, 72B, 72C) disposed on the first wall and configured to rotate about a second axis parallel to the first axis upon receipt of the drive force from the drive-transmission member to move the detected body irreversibly from a first position to a second position, the detected body being configured to move first in the first direction and then in a second direction opposite to the first direction relative to the first wall upon receipt of the drive force from the drive-transmission member, the detected body comprising: a detected portion protruding in a direction parallel to the second axis; and a receiving portion (88, 123) configured to receive the drive force from the drive-transmission member, wherein the drive-transmission member comprises: an abutment portion configured to abut on the receiving portion for transmitting the drive force to the detected body; and a first engaging portion configured to engage the detected body (72, 72A, 72B, 72C) at the first position upon rotation of the drive-transmission member to bring the abutment portion into abutment with the receiving portion (88, 123), the first engaging portion being positioned upstream of the abutment portion (E of 80) in the first direction, a distance between the detected portion and the first wall in the first direction being longer when the detected body (72, 72A, 72B, 72C) is at the second position than at the first position characterized in that the first engaging portion defines a moving path while the drive-transmission member rotates; and wherein the receiving portion is formed with a cutout portion positioned to overlap with the moving path of the first engaging portion as viewed in the first direction when the detected body (72, 72B, 72C) is at the first position, the cutout portion of the detected body at the first position being configured to allow the first engaging portion to pass through the cutout portion. a housing configured to accommodate developer therein and having a first wall and a second wall opposing each other in a first direction defined as a direction from the second wall toward the first wall; a drive-transmission member provided on the first wall and configured to rotate about a first axis parallel to the first direction for transmitting a drive force; and a detected body (72, 72A, 72B, 72C) disposed on the first wall and configured to rotate about a second axis parallel to the first axis upon receipt of the drive force from the drive-transmission member to move the detected body irreversibly from a first position to a second position, the detected body being configured to move first in the first direction and then in a second direction opposite to the first direction relative to the first wall upon receipt of the drive force from the drive-transmission member, the detected body comprising: a detected portion protruding in a direction parallel to the second axis; and a receiving portion (88, 123) configured to receive the drive force from the drive-transmission member, a detected portion protruding in a direction parallel to the second axis; and a receiving portion (88, 123) configured to receive the drive force from the drive-transmission member, wherein the drive-transmission member comprises: an abutment portion configured to abut on the receiving portion for transmitting the drive force to the detected body; and an abutment portion configured to abut on the receiving portion for transmitting the drive force to the detected body; and a first engaging portion configured to engage the detected body (72, 72A, 72B, 72C) at the first position upon rotation of the drive-transmission member to bring the abutment portion into abutment with the receiving portion (88, 123), the first engaging portion being positioned upstream of the abutment portion (E of 80) in the first direction, a distance between the detected portion and the first wall in the first direction being longer when the detected body (72, 72A, 72B, 72C) is at the second position than at the first position