Image forming apparatus

An image forming apparatus having an image carrier, image forming means for forming a toner image on said image carrier, transfer means for transferring the toner image formed on said image carrier onto a transfer medium, and fixing processing means including a pair of upper and lower fixing rollers for fixing the toner image onto the transfer medium, wherein the apparatus comprises

• curl correcting means, including a rotatable sponge roller and a fixed press member which presses said sponge roller while biting into part of an outer surface of said sponge roller, and provided downstream of said fixing processing means, and
• regulating means, provided immediately before said curl correcting means, so as to guide a leading end of the fixing-processed transfer medium to that position on the outer surface of said sponge roller which is tilted, within a range of 5° to 10° (both inclusive) from a-reference line that connects a center of said sponge roller and a press start position of said press member with respect to said sponge roller, to a direction opposite to a rotating direction of said sponge roller.