A sheet discharging device is provided with a sheet discharger including first and second rollers (18a,18b) and arranged downstream from the fixing device (17), a contact point (N) of the first and second rollers being located toward the pressing roller from a tangent line (B) on a point of a circumferential surface of the heat heating roller which intersects with a straight line connecting centers of the heating and pressing rollers, and a drive mechanism for driving the first roller and the heating roller so that a speed of the first roller at the circumferential surface thereof is greater than that of the heating roller. Accordingly, a sheet curled in the fixing device can be straightened with a simple construction.