A radiation image detection device comprising: a radiation image detector having a plurality of pixels arranged thereon, the radiation image detector performing accumulation operation, each pixel detecting radiation emitted from a radiation source to accumulate signal charge in the accumulation operation; an irradiation sensor for detecting the radiation, the irradiation sensor being constituted by one or plural pixels of the radation image detector; an irradiation detecting section; and a vibration sensor; and a control section characterized in that said irradiation detecting section is adapted to detect a start of irradiation of the radiation based on a signal from the irradiation sensor; and the control section is adapted to enable or to disable the irradiation detecting section based on a signal from the vibration sensor, wherein the control section includes a vibration detecting section for detecting magnitude of the signal from the vibration sensor, and the vibration detecting section outputs a first signal to the control section when the magnitude of the signal from the vibration sensor is greater than or equal to a first threshold value, and the control section disables the irradiation detecting section when the first signal is inputted from the vibration detecting section, wherein the irradiation detecting section outputs a second signal to the control section when magnitude of the signal from the irradiation sensor is greater than or equal to a second threshold value, and the second signal represents the start of the irradiation of the radiation, and the control section enables the irradiation detecting section to allow the radiation image detector to perform the accumulation operation when the second signal is inputted to the control section from the irradiation detecting section and the first signal is not inputted to the control section from the vibration detecting section. a radiation image detector having a plurality of pixels arranged thereon, the radiation image detector performing accumulation operation, each pixel detecting radiation emitted from a radiation source to accumulate signal charge in the accumulation operation; an irradiation sensor for detecting the radiation, the irradiation sensor being constituted by one or plural pixels of the radation image detector; an irradiation detecting section; and a vibration sensor; and a control section characterized in that said irradiation detecting section is adapted to detect a start of irradiation of the radiation based on a signal from the irradiation sensor; and the control section is adapted to enable or to disable the irradiation detecting section based on a signal from the vibration sensor, wherein the control section includes a vibration detecting section for detecting magnitude of the signal from the vibration sensor, and the vibration detecting section outputs a first signal to the control section when the magnitude of the signal from the vibration sensor is greater than or equal to a first threshold value, and the control section disables the irradiation detecting section when the first signal is inputted from the vibration detecting section, wherein the irradiation detecting section outputs a second signal to the control section when magnitude of the signal from the irradiation sensor is greater than or equal to a second threshold value, and the second signal represents the start of the irradiation of the radiation, and the control section enables the irradiation detecting section to allow the radiation image detector to perform the accumulation operation when the second signal is inputted to the control section from the irradiation detecting section and the first signal is not inputted to the control section from the vibration detecting section.