Image forming apparatus

An image forming apparatus comprising:

• a rotatable image bearing member configured to bear a toner image;
• a rotatable transfer member configured to form a transfer portion by contacting the image bearing member and to transfer the toner image to a recording material passing through the transfer portion from the image bearing member;
• a first driving source configured to drive the image bearing member;
• a second driving source configured to drive the transfer member;
• and
• a control portion configured to control the second driving source,
• wherein, based on a toner amount per unit area of the toner image transferred to each of a plurality of first divided regions into which a plane of the recording material is divided with respect to a feeding direction of the recording material, the control portion controls a driving speed of the transfer member while each of the plurality of the first divided regions passes through the transfer portion, and
• wherein the control portion acquires an index value correlating with a toner amount of the toner image transferred to each of a plurality of second divided regions into which each of the first divided regions is divided with respect to a widthwise direction crossing the feeding direction of the recording material, and the control portion controls the driving speed of the transfer member based on the index value while the corresponding first divided region passes through the transfer portion.