PURPOSE: To avoid the influence of the change of a sheet surface due to toner, etc., on a driven roller by arranging the driven roller so as to contact the opposed surface to the image formation surface of the sheet on which an image is formed.

CONSTITUTION: A sheet S on which an image is formed in an image formation part 1 is transported to an aslantly transporting device 7 for sheet and nipped by a driven roller 10 and a transport roller 9. Then, the driven roller 10 contacts the opposed surface Sb to an image formation surface Sa of the sheet, for example as the sheet S shifts without being influenced by the reduction of the contact friction with the sheet S because of the toner, etc., on the image formation surface Sa, one side is shifted largely than the other side, and the sheet is shifted so as to be surely aslantly transported. Then, the sheet S which contacts the opposed surface Sb of the image formation surface Sa of the sheet and is nipped by the driven roller 10 which shifts so as to aslantly feed the sheet S and the transport roller 9 is prevented from being influence by the toner, etc., on the image formation surface Sa, and aslantly fed in the prescribed direction surely and in stable manners.