A radiation image storage device composed of a fluorescent sheet which contains a phosphor which absorbs a radiation energy and emits a light of ultraviolet or visible region, and a radiation image storage panel having a fluorescent layer and a radiation image storage layer, in which the fluorescent layer contains a phosphor that absorbs a radiation energy and emits a light of ultraviolet or visible region, and the radiation image storage layer contains a stimulable oxide phosphor that absorbs the light emitted by the phosphors of the fluorescent layer and the fluorescent sheet to store energy of the absorbed light and releases the stored energy in the form of a light upon irradiation with a light of visible or infrared region is favorably employed for a radiation image storing and reproducing method.