An objective of this invention is to prevent leakage of radiation from a rotating gantry by providing a shielding body for reducing leakage of radiation (secondary radiation) having high permeability such as neutron or gamma ray in the rotating gantry.A rotating gantry (10) of this invention includes a shielding body (12) for reducing leaking dose of secondary radiation generated by collision of a charged particle beam (31) against an irradiating object (13), which is provided at a side opposite to a particle ray irradiation apparatus (58) with respect to the irradiating object (13).本發明之目的在於:藉由在旋轉支架設置減少中子或伽瑪射線等穿透性高的輻射線(二次輻射線)的洩漏之遮蔽體,以防止輻射線從旋轉支架中洩漏者。根據本發明之旋轉支架(10),係在相對於照射對象(13)而言與粒子線照射裝置(58)相對向之一側,具備有:使因荷電粒子束(31)碰撞於照射對象(13)所產生之二次輻射線的洩漏線量衰減之遮蔽體(12)。10‧‧‧旋轉支架11‧‧‧配重器12‧‧‧遮蔽體13‧‧‧照射對象14‧‧‧射束中心線15‧‧‧輻射線外周線16‧‧‧輻射線外周線19‧‧‧遮蔽體移動裝置20‧‧‧驅動裝置21‧‧‧驅動棒24‧‧‧支架內室31‧‧‧荷電粒子束55a、55b、55c‧‧‧偏轉電磁體56‧‧‧旋轉支架搭載部58‧‧‧粒子線照射裝置α‧‧‧角度
