A cartridge detachably mountable to an apparatus main body of an image forming apparatus, the cartridge comprising: a development roller configured to bear a developer thereon and to be rotatable about a rotational axis; a frame member including a development chamber in which the development roller is provided, a developer containing chamber containing the developer and located below the development chamber in a state where the cartridge is mounted in the apparatus main body, and a first opening portion through which the development chamber and the developer containing chamber are in communication, the developer containing chamber including an inner wall; and a stirring member provided rotatably in the developer containing chamber and configured to stir the developer contained in the developer containing chamber, the stirring member including a stirring shaft extending in a direction of the rotational axis and a sheet attached to the stirring shaft so as to rotate together with the stirring shaft, wherein the sheet of the stirring member is configured to rotate in contact with the inner wall of the developer containing chamber in such a manner that, after the sheet is elastically deformed by contact with a portion of the inner wall, at least a part of the elastic deformation is restored, thereby projecting the developer on the sheet toward the first opening portion, characterized in that the frame member includes a second opening portion for receiving the developer replenished from an outside of the cartridge into the developer containing chamber and the cartridge further comprises a conveyance member configured to be driven in such a manner that the developer is replenished into the developer containing chamber through the second opening portion, wherein the second opening portion of the developer containing chamber is disposed at a position in such a manner that the sheet passes through a front side thereof when the stirring member is rotating, and wherein the conveyance member is configured to be kept driven at a timing when the sheet passes through the front side of the second opening portion while the stirring member is rotating. a development roller configured to bear a developer thereon and to be rotatable about a rotational axis; a frame member including a development chamber in which the development roller is provided, a developer containing chamber containing the developer and located below the development chamber in a state where the cartridge is mounted in the apparatus main body, and a first opening portion through which the development chamber and the developer containing chamber are in communication, the developer containing chamber including an inner wall; and a stirring member provided rotatably in the developer containing chamber and configured to stir the developer contained in the developer containing chamber, the stirring member including a stirring shaft extending in a direction of the rotational axis and a sheet attached to the stirring shaft so as to rotate together with the stirring shaft, wherein the sheet of the stirring member is configured to rotate in contact with the inner wall of the developer containing chamber in such a manner that, after the sheet is elastically deformed by contact with a portion of the inner wall, at least a part of the elastic deformation is restored, thereby projecting the developer on the sheet toward the first opening portion, characterized in that the frame member includes a second opening portion for receiving the developer replenished from an outside of the cartridge into the developer containing chamber and the cartridge further comprises a conveyance member configured to be driven in such a manner that the developer is replenished into the developer containing chamber through the second opening portion, wherein the second opening portion of the developer containing chamber is disposed at a position in such a manner that the sheet passes through a front side thereof when the stirring member is rotating, and wherein the conveyance member is configured to be kept driven at a timing when the sheet passes through the front side of the second opening portion while the stirring member is rotating.