PROBLEM TO BE SOLVED: To provide a radiation irradiation device capable of storing storage property and portability, and capable of being handled even at a narrow place.SOLUTION: A radiation irradiation device comprises: a radiation generation part 10 for generating radiation； a collimator part 20 for controlling an irradiation range of the radiation generated by the radiation generation part 10； and an interval securing part 21 having a contact member 24 which contacts a subject when a distance between the radiation generation part 10 and the subject which is irradiated with the radiation becomes smaller than a preset distance, and securing an interval between the radiation generation part 10 and the subject. The interval securing part 21 can be detachably attached to teh collimator part 20, and can be attached at different rotary positions with a shaft passing a center of a diaphragm of the collimator part 20 and extending in an optic axis direction of the radiation, as a center shaft.SELECTED DRAWING: Figure 3【課題】収納性および可搬性を向上させることができ、かつ狭い場所でも取り扱いが容易な放射線照射装置を提供する。【解決手段】放射線を発生する放射線発生部１０と、放射線発生部１０において発生した放射線の照射範囲を制御するコリメータ部２０と、放射線発生部１０と放射線が照射される被検体とが予め設定された距離よりも近づいた場合に被検体に当接する当接部材２４を有し、放射線発生部１０と被検体との間隔を確保する間隔確保部２１とを備え、間隔確保部２１が、コリメータ部２０に対して着脱可能であり、かつコリメータ部２０の絞りの中心を通り、放射線の光軸方向に延びる軸を中心軸として異なる回転位置で取り付け可能である。【選択図】図３
