An image forming device performs a bi-directional printing operation and includes a unit that determines a first amount by calibrating a predetermined amount based on a first value relating to a positional offset of a print element, and a unit that determines a second amount by calibrating the predetermined amount based on a second value relating to a positional offset of another print element. A recording medium is conveyed in a conveying direction the first amount after one of forward and reverse prints and the second amount after the other of the forward and reverse prints.