Developer supply container and image forming apparatus capable of mounting the container thereon

An image forming apparatus comprising:

• developing means for developing a latent image formed on an image bearing member;
• and
• a developer supply container for supplying developer to said developing means, said developer supply container being detachably mountable to said image forming apparatus, wherein said developer supply container includes:
• a containing chamber for containing the developer;
• a first feeding member, which is provided in said containing chamber and which feeds the developer to an outlet of said containing chamber;
• a feeding chamber communicating with said containing chamber;
• a second feeding member, which is provided in said feeding chamber and which feeds the developer coming from said containing chamber to an outlet of said developer supply container;
• and
• a partition member for partitioning said developer supply container into said containing chamber and said feeding chamber,
• wherein a partitioning area of said partition member is much larger than an area of said outlet of said containing chamber.