Data conversion device and lamination shaping system

A data conversion device comprising:

• a layer data division section configured to generate layer data by dividing a target object into layers each having a thickness capable of being shaped by an inkjet method based on three-dimensional data of the target object to be subjected to lamination shaping;
• a grid data generation section configured to generate grid data by defining the layer data by grid regions, each indicating a position to which a droplet is ejected by the inkjet method;
• an impact diameter determination section configured to determine an impact diameter when the droplet is ejected;
• and
• an ejection position change section configured to change a position to which the droplet is ejected on the grid data based on the impact diameter, being determined by the impact diameter determination section, and a size of the grid region.