A breast radiation imaging and therapy apparatus for performing radiation imaging of a breast and having a therapy function of applying radiation to an affected part in the breast. The apparatus includes: (i) a table formed with an opening for allowing a breast of an examinee to pass through (ii) an imaging unit including a first radiation generating unit for applying an imaging radiation beam and a radiation detecting unit for detecting the radiation beam to output detection signals (iii) a therapy unit including a second radiation generating unit for applying a therapeutic radiation beam, the second radiation generating unit being movable in a tangential direction of a rotational track around a rotational axis and movable in a direction substantially orthogonal to the table and (iv) at least one rotational driving device for rotating the imaging unit and the therapy unit around the rotational axis.
