Prevention of an image defect due to discharging in a transfer portion and ensured transfer efficiency are both achieved. A control electrode is in contact with an outer circumferential surface of a secondary transfer roller on an upstream side of a position of contact between the secondary transfer roller and a recording medium in a direction of rotation of the secondary transfer roller. The control electrode has a potential set to a repel a toner image with respect to the secondary transfer roller. The control electrode is in contact with the outer circumferential surface of the secondary transfer roller under such a condition that discharging occurs in a gap between the secondary transfer roller and the intermediate transfer belt and a discharging current flows through the recording medium.