An image forming apparatus includes a plural image forming units each having a plural image forming sections, and an intermediate transfer body on which toner images formed by the plural image forming sections are primarily transferred, a plural secondary transfer units that are provided corresponding to the plural image forming units, and secondarily transfer the toner images of the intermediate transfer body to a recording medium, and a processor, in which each image forming unit has the image forming section of the same color, and the processor is configured to: in response to an instruction to output a color chart of the same color, execute a mode in which the color chart of the toner image having a density of intermediate gradation, formed by the image forming section of the same color for each image forming unit, is secondarily transferred to the recording medium and output.

An image forming apparatus includes: multiple intermediate-transfer-member density sensors that are disposed in the axial direction of an intermediate transfer member and that detect corresponding densities of a developer image having been subjected to first transfer onto the intermediate transfer member; and a processor configured to: in response to occurrence of a variation of density on a recording medium, if a relationship between the highest density value and the lowest density value among the density values detected by the respective intermediate-transfer-member density sensors indicates a first density state, output information indicating that the variation of density is caused in a process of or after a second-transfer process in which the developer image having been subjected to first transfer onto the intermediate transfer member is transferred onto the recording medium; and if the relationship indicates a second density state opposite to the first density state, output information indicating that the variation of density is caused in a process before the second-transfer process.