An ejection adjustment pattern forming method of forming an ejection adjustment pattern on a print medium with an inkjet head, which has a plurality of nozzles from which ink is ejected, with moving the inkjet head in a predetermined scanning direction, the method comprising: forming a plurality of thickness measurement patterns respectively in a plurality of pattern forming areas defined on the print medium and arranged in the predetermined scanning direction by causing the plurality of nozzles of the inkjet head to eject ink drops; forming a plurality of judging patterns respectively in the plurality of pattern forming areas defined on the print medium, the plurality of judging patterns being used to judge closeness of conditions in terms of a gap (Ga, Gb, Gc) between the inkjet head and the print medium with respect to an ideal condition representing an ideal gap (Ga) between the inkjet head and the print medium when each of the plurality of thickness measurement patterns is formed, wherein, in the step of forming the thickness measurement patterns, ejection conditions of the plurality of nozzles, when the plurality of thickness measurement patterns are formed, are the same among the plurality of pattern forming areas, wherein, the step of forming the judging patterns includes, forming a line-like first judging pattern in each of the plurality of pattern forming areas by causing the plurality of nozzles, which are used when the thickness measurement pattern is formed in the each of the plurality of pattern forming areas, to eject the ink, and forming a line-like second judging pattern, which is different from the first judging pattern, in each of the plurality of pattern forming areas by causing the plurality of nozzles, which are used when the thickness measurement pattern is formed in the each of the plurality of pattern forming areas, to eject the ink, and wherein the ejection conditions of the plurality of nozzles when the first judging pattern is formed and when the second judging pattern is formed are the same among the plurality of pattern forming areas. forming a plurality of thickness measurement patterns respectively in a plurality of pattern forming areas defined on the print medium and arranged in the predetermined scanning direction by causing the plurality of nozzles of the inkjet head to eject ink drops; forming a plurality of judging patterns respectively in the plurality of pattern forming areas defined on the print medium, the plurality of judging patterns being used to judge closeness of conditions in terms of a gap (Ga, Gb, Gc) between the inkjet head and the print medium with respect to an ideal condition representing an ideal gap (Ga) between the inkjet head and the print medium when each of the plurality of thickness measurement patterns is formed, wherein, in the step of forming the thickness measurement patterns, ejection conditions of the plurality of nozzles, when the plurality of thickness measurement patterns are formed, are the same among the plurality of pattern forming areas, wherein, the step of forming the judging patterns includes, forming a line-like first judging pattern in each of the plurality of pattern forming areas by causing the plurality of nozzles, which are used when the thickness measurement pattern is formed in the each of the plurality of pattern forming areas, to eject the ink, and forming a line-like second judging pattern, which is different from the first judging pattern, in each of the plurality of pattern forming areas by causing the plurality of nozzles, which are used when the thickness measurement pattern is formed in the each of the plurality of pattern forming areas, to eject the ink, and forming a line-like first judging pattern in each of the plurality of pattern forming areas by causing the plurality of nozzles, which are used when the thickness measurement pattern is formed in the each of the plurality of pattern forming areas, to eject the ink, and forming a line-like second judging pattern, which is different from the first judging pattern, in each of the plurality of pattern forming areas by causing the plurality of nozzles, which are used when the thickness measurement pattern is formed in the each of the plurality of pattern forming areas, to eject the ink, and wherein the ejection conditions of the plurality of nozzles when the first judging pattern is formed and when the second judging pattern is formed are the same among the plurality of pattern forming areas.