order to prevent this phenomenon the developer supply container 1 is provided with a partitioning wall 2 e as a member for preventing the developer having flowed back from the intermediary developer chamber 8 into the container proper 2 through the developer outlet 2 a while the developer outlet 2 a is facing upward during the rotation of the rotary from moving in the direction opposite to the direction in which the developer in the developer supply container 1 is conveyed by the developer conveyance ridges 2 d 1 and 2 d 2 the partitioning wall 2 e is placed on the internal surface of the top section 2 1 of the container proper 2 being positioned to oppose the developer outlet 2 a of the bottom section 2 2 of the container proper 2 with the provision of this partitioning wall 2 e the developer having flowed back into the developer supply container 1 as described above is at least partially prevented from being dispersed in the container proper 2 the portion of the developer having flowed back into the developer supply container 1 which was prevented from being dispersed in the container proper 2 is temporarily held in the temporary storage 2 f fig7 then it is discharged again from the developer outlet 2 a along with the developer having been guided to the adjacencies of the developer outlet 2 a by the developer conveyance ridges as the developer supply container 1 is orbitally moved by the rotation of the rotary the partitioning wall 2 e also contributes to the prevention of the problem.