In the first process, imaging is performed to obtain a tomosynthesis surface setting image. In X-ray tomosynthesis imaging, a subject (9) to be imaged is imaged while laid down on a bed table (25). An X-ray generator (13) and X-ray image detector (19) are positioned to laterally image the subject (9) in this lying state. In the second process, tomosynthesis surface information such as the position, range, and shape of a tomosynthesis surface is set. In the third process, a path, tomosynthesis angle, and fan angle are calculated to obtain a necessary amount of set tomosynthesis surface information, thereby executing data acquisition.