An image forming apparatus that inhibits malfunctions therein via control such that respective developing devices change positions at predetermined timings. In a color laser printer, a first position is a position on a photosensitive drum facing a developing roller established when a developing roller moves to a developing position. A second position is a position on a photosensitive drum facing another developing roller when the developing roller moves to a developing position. First and second corresponding portions are portions on the conveying belt respectively corresponding to the first and second positions. The timing for moving the first developing roller and the second developing roller is controlled via a control apparatus and actuator such that a distance between the first corresponding portion and the second corresponding portion is less than a reference distance determined when the first developing roller and the second developing roller simultaneously approach the photosensitive drum.