A radiographic imaging apparatus for taking a radiographic image of a subject using at least one radiation detector (22A, 22B), the apparatus comprising: information obtaining means being arranged to obtain calibration information by carrying out calibration of the the at least one radiation detector (22A, 22B); storage means being arranged to store the calibration information of the at least one radiation detector with associating the calibration information with the at least one radiation detector; image processing means being arranged to apply image processing to imaging data of the radiographic image of the subject detected by the radiation detector based on the calibration information; detecting means being arranged to detect at least one of conditions including that power is applied to the radiation detector, that a predetermined time period has elapsed from the application of power, and that the radiation detector is connected; and control means being arranged to determine, when at least one of the conditions is detected by the detecting means, whether or not the calibration information of the at least one radiation detector is appropriate, and if a negative determination is made, controlling the information obtaining means to enable the calibration, wherein the control means is arranged to determine, with respect to the at least one radiation detector, that calibration is unnecessary if 1) a predetermined time period has not elapsed from a time and date when the last calibration was carried out, 2) if an accumulated number of times of imaging with the radiation detector has not exceeded a predetermined number of times, and wherein the at least one radiation detector is a rechargeable wireless radiation detector, characterized in that the control means is arranged to determine whether or not the at least one radiation detector is being recharged, and if an affirmative determination is made, the control means enables the calibration. information obtaining means being arranged to obtain calibration information by carrying out calibration of the the at least one radiation detector (22A, 22B); storage means being arranged to store the calibration information of the at least one radiation detector with associating the calibration information with the at least one radiation detector; image processing means being arranged to apply image processing to imaging data of the radiographic image of the subject detected by the radiation detector based on the calibration information; detecting means being arranged to detect at least one of conditions including that power is applied to the radiation detector, that a predetermined time period has elapsed from the application of power, and that the radiation detector is connected; and control means being arranged to determine, when at least one of the conditions is detected by the detecting means, whether or not the calibration information of the at least one radiation detector is appropriate, and if a negative determination is made, controlling the information obtaining means to enable the calibration, wherein the control means is arranged to determine, with respect to the at least one radiation detector, that calibration is unnecessary if 1) a predetermined time period has not elapsed from a time and date when the last calibration was carried out, 2) if an accumulated number of times of imaging with the radiation detector has not exceeded a predetermined number of times, and wherein the at least one radiation detector is a rechargeable wireless radiation detector, characterized in that the control means is arranged to determine whether or not the at least one radiation detector is being recharged, and if an affirmative determination is made, the control means enables the calibration. 1) a predetermined time period has not elapsed from a time and date when the last calibration was carried out, 2) if an accumulated number of times of imaging with the radiation detector has not exceeded a predetermined number of times, and wherein the at least one radiation detector is a rechargeable wireless radiation detector, characterized in that the control means is arranged to determine whether or not the at least one radiation detector is being recharged, and if an affirmative determination is made, the control means enables the calibration.