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An image forming device includes an image forming section which includes a recording head having nozzles and which forms an image on a recording medium by discharging ink from the nozzles, a scanning section which scans the image formed on one face of the recording medium, a conveying section which conveys the recording medium for the recording medium to pass by the image forming section and the scanning section with its one face facing them, and an inverting section which inverts the recording medium having the image formed on one face thereof and conveys the recording medium to the upstream of the image forming section. The scanning section is disposed downstream of the image forming section and upstream of the inverting section. The image includes a test chart as a pattern image for detection of nozzle clogging.