An electrostatic latent image is formed on an image carrier. A plurality
of development cartridges include toner and are adapted to face the image
carrier at a development position, respectively. The development
cartridges cause the toner to adhere onto the image carrier to develop
the electrostatic latent image as a toner image. A development device is
configured to be rotatable around an rotational axis thereof. The
development device houses the plurality of development cartridges around
the rotational axis. A duct includes an inlet port through which air in
the vicinity of the development position is sucked and an outlet port
from which the sucked air is exhausted to the outside of the image
forming apparatus. The duct covers an outer peripheral surface of the
development device.