A particle accelerator, as well as a can irradiate an irradiation target with the outer shell which is rotatable about a rotational axis, a charged particle beam, a charged particle beam irradiation apparatus according to the present invention, the outer shell forms a cylindrical It includes a projecting unit for irradiating direction changes with the rotation, and a beam transport line for transporting the irradiated and the charged particle beam, a beam transport line and the particle accelerator is accommodated at least partially in the outer shell in .本発明に係る荷電粒子線照射装置は、粒子加速器と、筒形状をなし回転軸周りに回転可能な外殻部と、荷電粒子線を照射目標に向けて照射可能であると共に、外殻部の回転に伴って照射方向が変化する照射部と、上記荷電粒子線を照射部へ輸送するビーム輸送ラインと、を備え、粒子加速器及びビーム輸送ラインは、外殻部内に少なくとも一部が収容される。
