An box producing apparatus is disclosed, including a camera that obtains an image of a printed face which is printed on a box material sheet by the printing section; and a register correction control unit that compares a specific picture in a master image of a sample for the print, and a picture in a region specified according to the specific picture in the image of the printed face obtained by the camera to determine an amount of register displacement in each of the print units, and controls a register adjustment mechanism provided in each of the print units based on the amount of register displacement to correct a register of the print.