The color image forming apparatus comprises a transfer belt device which feeds
a transfer member such as a paper and a plurality of image forming units. The image
forming units are disposed facing towards the transfer belt device. The transfer
belt device, at least in a portion in which the image forming units have been disposed,
is arranged such that it is inclined with respect to the ground. Each of the image
forming unit forms a desired image and sequentially transfers the formed image
on the transfer member fed by the transfer belt device.