An image forming apparatus includes a plurality of image forming units, a patch forming unit which actuates the respective image forming units to form density detection patches of the respective colors, a density detecting unit that detects a density of the density detecting patches, a condition correcting unit that controls the density detecting unit to detect the density of the density detecting patches of the respective colors, and corrects the image forming conditions based on respective deviations, a patch re-forming unit that, for each color for which the respective deviation is greater than a threshold value, generates a re-formed density detecting patch of the color using the respective image forming condition previously corrected by the condition correcting unit, and a condition re-correcting unit that controls the density detecting unit to detect a density of the re-formed density detecting patch and re-correct the respective image forming condition.