Image forming apparatus

An image forming apparatus comprising:

• a photosensitive member rotated in a predetermined direction;
• a charging unit configured to charge a circumferential surface of the photosensitive member;
• a developing unit carrying a developer including toner and carriers, and including a developer bearing member configured to apply toner charged in a first polarity to the circumferential surface of the photosensitive member;
• a first voltage applying unit configured to apply a first voltage of the first polarity to the charging unit;
• a second voltage applying unit configured to apply a second voltage of the first polarity to the developer bearing member;
• a first voltage detecting unit configured to detect the first voltage;
• a second voltage detecting unit configured to detect the second voltage;
• and
• a controller, wherein
• the controller determines whether or not to make a second rate lower than a first rate according to the second voltage at a first timing when the first voltage reaches a first predetermined voltage after causing the first voltage applying unit and the second voltage applying unit to start application of the first voltage and the second voltage, respectively, the second rate being a rate at which an absolute value of the second voltage increases per unit time after the first timing, the first rate being a rate at which an absolute value of the second voltage increases per unit time before the first timing.