Providing a radiation emission unit having multiple radiation sources for emitting radiation onto a subject, in which the multiple radiation sources are distributed such that the radiation emitted from each radiation source and transmitted through the subject forms a part of a projected image of the subject. Each radiation source is a source that emits fan beam radiation and is disposed such that a plane of the fan beam having a wider spread angle intersects with an arrangement direction of the multiple radiation sources and is arranged parallel to each other.