The present invention provides an image forming device which forms an image by ejecting an ink drop and a reaction liquid drop which reacts with the ink drop. The image forming device includes: an ink drop ejecting data generating component, a reaction liquid ejecting data generating component, and an image forming component. The ink drop ejecting data generating component, on the basis of image data, generates ink drop ejecting data. The reaction liquid ejecting data generating component generates reaction liquid ejecting data, on the basis of ink drop ejecting data of a pixel of interest and the like. The image forming component forms an image by ejecting the ink drop on the basis of the ink drop ejecting data and ejecting the reaction liquid drop on the basis of the reaction liquid ejecting data.