Image forming apparatus

An image forming apparatus comprising:

• a rotatable photosensitive member;
• a charging member configured to charge said photosensitive member by being supplied with a DC voltage;
• an image forming station configured to form an image on said photosensitive member charged by said charging member to form an electrostatic image;
• a current detector configured to detect a DC current flowing to said charging member when said charging member is supplied with a DC voltage from said voltage source;
• an executing portion configured to execute pre-charging operation for charging by said charging member said photosensitive member a which is rotating, after production of an image formation signal prior to image forming operation by said image forming station;
• and
• a controller configured to control an amount of rotation of said photosensitive member in the pre-charging operation on the basis of a DC current detected by said current detector during the pre-charging operation.