An image information detecting cassette intended for use in x-ray imaging, comprising: an image information detecting section adapted to record image information by storing charges generated by the irradiation of the recording radiation carrying said image information, a detecting section driving means adapted to apply a recording voltage to said image information detecting section, a reading out means adapted to read out image signals in accordance with said image information recorded in said image information detecting section, a power supply wiring means connected to a power source and configured to supply power to said detecting section driving means and reading out means, a case adapted to accommodate said image information detecting section, detecting section driving means, reading out means, and power supply wiring means, characterized by an abnormal state detecting means adapted to detect an abnormal state, i. e. a state of inner troubles and damages or potential inner troubles and damages, of said image information detecting section, detecting section driving means, or reading out means, a power supply inhibiting means adapted to inhibit said power supply from said power supply wiring means to said detecting section driving means when said abnormal state is detected by said abnormal state detecting means, an acceleration sensor, wherein said abnormal state detecting means comprises an abnormal acceleration state determining means adapted to determine as an abnormal state an abnormal acceleration state in which the acceleration detected by said acceleration sensor is greater than or equal to a predetermined dangerous level. an image information detecting section adapted to record image information by storing charges generated by the irradiation of the recording radiation carrying said image information, a detecting section driving means adapted to apply a recording voltage to said image information detecting section, a reading out means adapted to read out image signals in accordance with said image information recorded in said image information detecting section, a power supply wiring means connected to a power source and configured to supply power to said detecting section driving means and reading out means, a case adapted to accommodate said image information detecting section, detecting section driving means, reading out means, and power supply wiring means, characterized by an abnormal state detecting means adapted to detect an abnormal state, i. e. a state of inner troubles and damages or potential inner troubles and damages, of said image information detecting section, detecting section driving means, or reading out means, a power supply inhibiting means adapted to inhibit said power supply from said power supply wiring means to said detecting section driving means when said abnormal state is detected by said abnormal state detecting means, an acceleration sensor, wherein said abnormal state detecting means comprises an abnormal acceleration state determining means adapted to determine as an abnormal state an abnormal acceleration state in which the acceleration detected by said acceleration sensor is greater than or equal to a predetermined dangerous level.