Image forming apparatus

An image forming apparatus, comprising:

• an image bearing member that is cylindrical in shape and has a photosensitive layer formed on an outer peripheral surface thereof;
• a conductive member that is disposed so as to make contact with an inner peripheral surface of the image bearing member and has a dielectric property;
• a bias application device that applies a bias including an alternating current bias to the conductive member;
• and
• a control portion that controls the bias application device,
• wherein
• image formation is performed on a surface of the image bearing member while the image bearing member is made to rotate, and
• the image forming apparatus is capable of executing a heating-up mode in which an alternating current bias having a peak-to-peak value twice or more as large as a discharge start voltage between the conductive member and the image bearing member is applied to the conductive member to cause the surface of the image bearing member to be heated up.