The present invention has: a scanning electromagnet that scans a charged particle beam and a radiation control apparatus that calculates the value of setting magnetic field corresponding to a coordinate of target radiation position on the radiation object scanned by the charged particle beam according to the scanning electromagnet, calculates a setting current value of the scanning electromagnet based on the value of setting magnetic field and the value of variation of a predetermined magnetic field from a turning magnetic field that the magnetic moment of the scanning electromagnet turns into the opposite direction. Therefore, it is possible to shorten beforehand preparation time and perform a beam radiation with high accuracy.粒子射線治療裝置係包括:掃描電磁鐵,係掃描帶電粒子射束;以及照射管理裝置,係算出與藉由掃描電磁鐵掃描帶電粒子射束之在照射對象之目標照射位置座標對應之設定磁場的值,並依據設定磁場的值及距掃描電磁鐵的磁矩轉換成反方向之折返磁場之預定的磁場變化量的值,來算出掃描電磁鐵的設定電流值,藉此,可縮短事前準備的時間並且實現高精度的射束照射。S404、S406、S501~S512‧‧‧步驟
