A collimator, a radiation detection apparatus, and a radiation inspection apparatus that can further remove scattered radiation are provided. The collimator 20 of the present invention includes a radiation shielding part 22 and a radiation shielding part 21 that has a radiation shielding rate lower than that of the radiation shielding part 22, penetrates the radiation shielding part 22, and is solid. According to the collimator 20 of the present invention, since the X-ray transmission part 21 of the collimator 20 is solid, X-rays on the low energy side scattered by the subject B are absorbed by the X-ray transmission part 21. Therefore, there is little noise contained in the X-rays detected by the radiation detection element 30, and an X-ray image with high resolution can be obtained. 散乱放射線をさらに除去可能なコリメータ、放射線検出装置、及び放射線検査装置を提供する。 本発明のコリメータ２０は、放射線遮蔽部２２と、前記放射線遮蔽部２２よりも放射線遮蔽率が低く、前記放射線遮蔽部２２を貫通し、且つ中実の放射線透過部２１と、を備える。本発明のコリメータ２０によると、コリメータ２０のＸ線透過部２１が中実であるので、Ｘ線透過部２１において被検体Ｂで散乱された低エネルギー側のＸ線が吸収される。したがって放射線検出素子３０で検出されるＸ線に含まれるノイズが少なく、解像度の高いＸ線画像を得ることができる。
