Image forming apparatus

An image forming apparatus comprising:

• an image bearing member configured to bear a toner image;
• a transfer member configured to transfer the toner image from the image bearing member onto a recording material in a transfer portion;
• a first applying portion configured to apply a transfer bias to the transfer member;
• a recording material charging member, provided upstream of the transfer portion with respect to a recording material conveying direction, configured to electrically charge a toner image transfer surface, which is a surface of the recording material conveyed toward the transfer portion where the toner image is transferred onto the surface, to an opposite polarity to a normal charge polarity of toner;
• a second applying portion configured to apply a recording material charging bias to the recording material charging member;
• a detecting portion configured to detect a current flowing through the transfer member or a voltage applied to the transfer member;
• and
• a controller configured to control the recording material charging bias on the basis of a detection result by the detecting portion when a charging region of the recording material charged by the recording material charging member passes through the transfer portion.