To surely prevent a discharge from a radiation cassette to hands etc., with a simple constitution.

The destaticization structure 50 is provided with flexible conductive members 44a and 44b, holding pins 46a and 46b. The flexible conductive members 44a and 44b are inserted into the groove parts 38 formed in side wall parts 28a and 28b, and connected to the conductive layer 32 of a surface plate 24, further, the end parts of the flexible conductive members 44a and 44b are exposed in recessed parts 40a and 40b. And when the radiation cassette is arranged in a processor, the holding pins 46a and 46b are inserted into the recessed parts 40a and 40b, then, the pins come into contact with the flexible conductive members 44a and 44b.