A developer container for an image forming apparatus, said developer container including a rotatable member; a container body for containing a developer; a sealing member, provided in the container body, for preventing leakage of the developer out of the container body; a sheet, provided in the container body, for contacting the rotatable member to guide the developer into the container body; a gap provided between the container body and the sealing member and covered by the sheet; a communication hole provided in the container body in fluid communication with the gap; packing material filled in the gap through the communication hole for preventing leakage of the developer through the gap.