Image forming apparatus and collecting container

An image forming apparatus comprising:

• a collecting container, provided detachably mountable to a main assembly, for collecting a toner fed from the main assembly;
• a plurality of connecting portions, provided at one side surface of said collecting container, for connecting the main assembly and said collecting container;
• a plurality of shutters for opening and closing said plurality of connecting portions, respectively;
• a plurality of first urging members for urging said plurality of shutters, respectively, in a closing direction;
• a movable member provided movably at a bottom of said collecting container, wherein said movable member is accommodated toward said collecting container by contact with the main assembly when said collecting container is mounted in a mounting portion, and is projected outwardly than a side portion of said collecting container when said collecting container is dismounted from the mounting position;
• and
• a second urging member for urging said movable member in a direction of projecting said movable member from said collecting container,
• wherein when said collecting container is mounted in the main assembly, said plurality of first urging members and said second urging member are provided so that a sum of rotation moment acting on said collecting container by said plurality of first urging members, and rotation moment acting on said collecting container by said second urging member are directed opposite to each other.