A first thermal head (132) is provided with at least one first heating element to perform printing on a first printing medium transported by first transporting means (134). A second thermal head (142) is provided with at least one second heating element to perform printing on a second printing medium (112) transported by second transporting means (144). A controller (200) controls the first thermal head (132) and the second thermal head (142) such that a first time period for which the first heating element is energized and a second time period for which the second heating element is energized do not overlap, while simultaneously driving a first motor (136) for driving the first transporting means and a second motor (146) for driving the second transporting means (144) at the same speed.