A developer holding apparatus, comprising: a first chamber that holds a developer material therein and that includes an opening through which the developer material is discharged; a first rotatable member rotatably received in the first chamber; a second chamber adjacent to the first chamber and holding the developer material therein; a second rotatable member rotatably received in the second chamber; a communication port through which the first chamber communicates with the second chamber; and a shutter received in the first chamber, the shutter including: a first sealing wall that opens and closes the communication port; and a second sealing wall that opens and closes the opening; wherein the first sealing wall and the second sealing wall are interlocked so that the opening and the communication port are opened and closed together; wherein the first chamber and second chamber extend in a longitudinal direction, and the shutter includes a plurality of ribs aligned in the longitudinal direction; wherein the plurality of ribs prevent the first rotatable member and the second rotatable member from interfering with each other; wherein the first rotatable member includes a first member having a plurality of cuts (35b1-35b4) to define a plurality of first resilient strips (35a1-35a5) aligned in a direction substantially parallel to a rotational axis of the first rotatable member, and the second rotatable member includes a second member having a plurality of cuts (37b1-37b4) to define a plurality of second resilient strips (37a1-37a5) aligned along a rotational axis of the second rotatable member; wherein the plurality of first resilient strips (35a1-35a5) and the plurality of second resilient strips (37a1-37a5) are brought into contact with the plurality of ribs when the first and second rotatable members (30, 49) rotate; and wherein the plurality of ribs do not face the plurality of cuts (35b1-35b4) of the first member and the plurality of cuts (37b1-37b4) of the second member, and prevent the plurality of first resilient strips (35a1-35a5) from entering the second chamber and the plurality of second resilient strips (37a1-37a5) from entering the first chamber. a first chamber that holds a developer material therein and that includes an opening through which the developer material is discharged; a first rotatable member rotatably received in the first chamber; a second chamber adjacent to the first chamber and holding the developer material therein; a second rotatable member rotatably received in the second chamber; a communication port through which the first chamber communicates with the second chamber; and a shutter received in the first chamber, the shutter including: a first sealing wall that opens and closes the communication port; and a second sealing wall that opens and closes the opening; a first sealing wall that opens and closes the communication port; and a second sealing wall that opens and closes the opening; wherein the first sealing wall and the second sealing wall are interlocked so that the opening and the communication port are opened and closed together; wherein the first chamber and second chamber extend in a longitudinal direction, and the shutter includes a plurality of ribs aligned in the longitudinal direction; wherein the plurality of ribs prevent the first rotatable member and the second rotatable member from interfering with each other; wherein the first rotatable member includes a first member having a plurality of cuts (35b1-35b4) to define a plurality of first resilient strips (35a1-35a5) aligned in a direction substantially parallel to a rotational axis of the first rotatable member, and the second rotatable member includes a second member having a plurality of cuts (37b1-37b4) to define a plurality of second resilient strips (37a1-37a5) aligned along a rotational axis of the second rotatable member; wherein the plurality of first resilient strips (35a1-35a5) and the plurality of second resilient strips (37a1-37a5) are brought into contact with the plurality of ribs when the first and second rotatable members (30, 49) rotate; and wherein the plurality of ribs do not face the plurality of cuts (35b1-35b4) of the first member and the plurality of cuts (37b1-37b4) of the second member, and prevent the plurality of first resilient strips (35a1-35a5) from entering the second chamber and the plurality of second resilient strips (37a1-37a5) from entering the first chamber.