Inkjet printing device, box making machine and corrugating machine

An inkjet printing device is provided with: a conveyance path (Ls) for conveying, in a conveyance direction (MD), a sheet (10) assembled in a corrugated board carton having a plurality of wall sections; and inkjet heads (23A, 23B) that are disposed in the conveyance path (Ls) so as to face the surface of the sheet (10), and that are capable of printing a printing pattern (24) within predetermined printing ranges (P1A, P1B) along an intersecting direction (CD) in which the surface of the sheet (10) and the conveyance direction (MD) intersect. The inkjet heads (23A, 23B) are disposed such that the printing ranges (P1A, P1B) span first regions (32A, 32C), which are regions predetermined to be first wall sections when the paper (10) is assembled in the cardboard carton, and second regions (32B, 32D), which are regions adjacent to the first regions (32A, 32C) in the intersecting direction (CD) and predetermined to be second wall sections different from the first wall sections, respectively, and the printing ranges