An image forming apparatus for forming an appropriate test pattern is provided. A control section 41 includes: an image combination section 412 for combining image information corresponding to a subject image P1 of a first resolution, with second pattern information which corresponds to a test pattern P2 of a second resolution different from the first resolution, and which represents image information of the first resolution, so as to generate combined image information as one piece of image information; and an operation instruction section 413 for instructing a recording head 1, a head driving section 2, and a medium driving section 3 to form, on a recording medium, the combined image information corresponding to one piece of image information.