A developer collecting container detachably mountable to a rotatable member which is provided in an image forming apparatus to rotate a developing device, the developer collecting container which is rotatable while being substantially fixed to the rotatable member with the developing device, the developer collecting container includes a receiving port for receiving a developer discharged from the developing device; an accommodating portion for accommodating the developer collected from the developing device; a guiding pipe, having a discharge opening for permitting discharging of the developer into the accommodating portion, for guiding the developer receiver at the receiving port with rotation of the rotatable member to the discharge opening, wherein the discharge opening is disposed adjacent a center of gravity of the developer collecting container.