An image forming device forms images of a plurality of pages on a continuous sheet, and the image forming device includes: a hardware processor that: stores the images to be formed on the sheet in a page unit; writes image data to be stored to the hardware processor from the images of the plurality of pages in the hardware processor as pieces of information on a plurality of pixels arrayed in a first direction and a second direction; reads the image data written in the hardware processor; and acquires a correction amount to correct a deviation between a conveying direction of conveying the sheet to an image former and the second direction of the image data; and the image former that forms the images on the sheet based on the image data read by the hardware processor.