Image forming apparatus

An image forming apparatus that forms an image on a recording material, comprising:

• an apparatus main body having a plurality of photosensitive drums including a first photosensitive drum, a plurality of developing units aligned in a first direction, and an air supply portion, the plurality of developing units including a first developing unit provided with a first receiving port and having a first developing roller that supplies developer received from the first receiving port to the first photosensitive drum;
• and
• a plurality of developer containers aligned in a second direction orthogonal to the first direction, the plurality of developer containers including a first developer container that accommodates the developer, is provided with a first discharge port, and is attachable to and detachable from the apparatus main body,
• wherein the apparatus main body includes
• an attachment portion to and from which the plurality of developer containers is attachable and detachable, the attachment portion being provided with a first communication port that is capable of being in communication with the first discharge port, and
• a plurality of pipes through which developer conveyed from the plurality of developer containers to the plurality of corresponding developing units passes by air supplied from the air supply portion, the plurality of pipes including a first pipe which extends from the first communication port to the first receiving port and through which the developer discharged from the first discharge port passes, wherein,
• in a case where one end surface and the other end surface of the apparatus main body in the second direction are defined as a first end surface and a second end surface, respectively,
• the first developer container is provided, in the second direction, at a position closest to the first end surface among the plurality of developer containers,
• the first pipe is provided, in the second direction, at a position closest to the first end surface among the plurality of pipes, and
• at least a part of the first communication port overlaps the first receiving port in a case of being viewed in the first direction.