There is described an image forming apparatus combined with a finisher for applying finish processing such as stapling. The image-forming apparatus includes: a reading section to read an original image so as to generate image data of the original image; a designating section to designate a first direction of the original image to be read by the reading section and a second direction of an output image to be ejected; an image-processing section to apply image-processing, which includes an image-rotation processing, to the image data so as to generate processed image data; a controlling section to control a rotation angle to be employed for rotating the image data by the image-rotation processing, referring to the first direction and the second direction, so that a direction of the output image coincides with the second direction; and an image-forming section to form the output image based on the processed image data.