A solid-state radiation detector is provided which has an improved
positional precision within a casing thereof while ensuring the shock
resistance properties. A radiation cassette comprises: a solid-state
radiation detector which is an image pickup device, a casing constituted
by upper and lower shell halves and accommodates therein the solid-state
radiation detector and the like. Each of the upper and lower shell halves
comprises: an outer frame; an inner frame, and a coupling member for
coupling the outer and inner frames. A space between the outer frame and
the inner frame is filled with a shock absorbing material, thereby
imparting shock absorbency to the casing itself. The solid-state
radiation detector is rigidly secured to the inner frame of the lower
shell half.