Irradiation nozzle, particle beam therapy device, particle beam therapy system, and method for controlling particle beam therapy system

In order to reduce the size of a device and achieve high-precision beam irradiation, an irradiation nozzle (4) for irradiating an object (Pt) with a radiation therapy beam has a nozzle base end section (42) fixed to a beam axis (40) through which the radiation therapy beam passes, and a nozzle tip section (44) for irradiating the object (Pt) with the radiation therapy beam that has passed through the nozzle base end section (42). The nozzle tip (44) is configured so as to be fixed to a first position when a radiation therapy beam is applied to an object (Pt), and to be fixed to a second position when the object is imaged, and is provided with a curved movement path in which the nozzle tip (44) can move between the first position and the second position. 为了实现装置的小型化和高精度的射束照射，向对象物(Pt)照射放射线治疗射束的照射喷嘴(4)具有固定在放射线治疗射束通过的射束轴(40)上的喷嘴基端部(42)和向对象物(Pt)照射通过了喷嘴基端部(42)的放射线治疗射束的喷嘴前端部(44)，喷嘴前端部(44)构成为在向对象物(Pt)照射放射线治疗射束时固定于第一位置，在拍摄对象物时固定于第二位置，设置有喷嘴前端部(44)能够在第一位置与第二位置之间移动的弯曲状的移动路径。