Image forming apparatus

An image forming apparatus comprising:

• an image bearing member;
• a developer bearing member;
• a stirring member that is movable;
• a frame that supports the developer bearing member and constitutes a developer housing chamber that contains a developer to be supplied to the developer bearing member;
• and
• a cover movable between a first position and a second position,
• wherein:
• the developer bearing member develops, by using the developer, an electrostatic latent image formed on the image bearing member by an exposing unit,
• the developer housing chamber has an attachment port to which a developer supplying container with a developer stored therein is detachably attached and positioned,
• the first position is a position at which the cover covers the attachment port, and the second position is a position at which the attachment port is accessible from outside,
• when the cover is at the second position and the developer supplying container is attached to the attachment port so as to allow an interior of the developer supplying container and the developer housing chamber to communicate with each other, the developer stored in the developer supplying container is moved to the developer housing chamber due to own weight of the developer, and
• in a state in which the developer supplying container is attached to the attachment port, as viewed in a vertical direction of gravitational force, an upper portion of the developer supplying container is located on an outward upper side with respect to the first position in the image forming apparatus;
• and when the developer supplying container is detached from the attachment port, the cover is movable from the second position to the first position.