The present invention provides a charged particle beam radiating device that has a reduced device size, and is able to prevent ingress of radiation from an electromagnet (41) into an irradiation chamber. The charged particle beam radiating device is provided with: a conveyance line that conveys a charged particle beam a radiating unit that radiates the charged particle beam to an irradiation subject and a rotating gantry that supports the conveyance line (31) and the radiating unit, and that has a tube body that can rotate around a rotational axis line (P). The inclined section of the conveyance line is configured disposed passing through the inside of the tube body. As a result, the amount of overhang of the conveyance line overhanging in the radial direction is reduced. Also, a configuration is used provided with an occluding member (61) that occludes the radiation from the electromagnet (41).本發明提供一種可實現裝置的小型化,並且能夠防止來自電磁鐵(41)的放射線進入照射室內之帶電粒子束照射裝置。本發明的帶電粒子束照射裝置,係具備:輸送帶電粒子束之輸送管道、朝被照射體照射帶電粒子束之照射部、及具有支承輸送管道(31)和照射部且能夠繞旋轉軸線P旋轉之筒體之旋轉支架,配置成使輸送管道的傾斜部通過筒體內。藉此,減小朝徑向伸出之輸送管道的伸出量。並且具有屏蔽來自電磁鐵(41)的放射線之屏蔽構件(61)。41‧‧‧電磁鐵45‧‧‧磁軛46‧‧‧線圈61‧‧‧屏蔽構件
