The portable type radiation detection unit 10 which possesses the detection panel 12 which is accommodated inside cassette 14. It converts the effective territory of unit 10 maximally in particular side section and 18 in order to make that the picture it forms the territory where subject 200 is difficult to reach possible, in order for it to be possible, to be able to provide shocking absorption function at least in corner 16, the majority of margins or completely in at least one side section 18 of the unit 10 which is not, with the marginal edge and the inner wall of cassette 14, it can provide margin around detection panel 12 in at least the corner 16 of detection panel 12.
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