Patent ID: 8805236

Claim:
An image forming apparatus, comprising: a plurality of photosensitive drums arranged in a first direction, each of the plurality of photosensitive drums being configured to have an image formed thereon and to rotate about an axis extending along a second direction perpendicular to the first direction; a plurality of developing rollers each of which configured to feed a developing agent to a corresponding one of the plurality of photosensitive drums; an intermediate transfer belt and a secondary transfer roller which are configured to transfer the image on each of the plurality of photosensitive drums onto a sheet; a plurality of developing agent cartridges each of which containing a developing agent to be supplied to a corresponding one of the plurality of developing rollers; and a frame member including: a plurality of accommodating portions each of which configured to accommodate a corresponding one of the plurality of developing agent cartridges; and a plurality of sectioning wall portions each of which extending vertically and defining a boundary between corresponding two of the plurality of accommodating portions next to each other, such that the plurality of developing agent cartridges accommodated in the plurality of accommodating portions is arranged in the first direction in which the plurality of photosensitive drums is arranged, wherein each of the plurality of sectioning wall portions has a first surface which faces and is exposed to one of the plurality of developing agent cartridges and a second surface which faces and is exposed to another of the plurality of developing agent cartridges.