A nondestructive inspection device comprising: a conveyor unit that conveys a subject to be inspected in a predetermined direction; a radiation source that irradiates the conveyor unit with a radiation directed so as to intersect a conveying direction caused by the conveyor unit; a first radiation detector that detects the radiation emitted from the radiation source in a first energy range; a second radiation detector that detects the radiation emitted from the radiation source in a second energy range higher than the first energy range; a first calculation unit that calculates from luminance data of the radiation detected by the first radiation detector a value indicating a first transmittance in the first energy range of the radiation transmitted from the radiation source through the subject; a second calculation unit that calculates from luminance data of the radiation detected by the second radiation detector a value indicating a second transmittance in the second energy range of the radiation transmitted from the radiation source through the subject; a detection unit that detects a positional deviation detail of the radiation source according to a ratio or difference between the value indicating the first transmittance calculated by the first calculation unit and the value indicating the second transmittance calculated by the second calculation unit by computing a transmittance pattern constituted by an assembly of ratios or differences of values indicating the first and second transmittances and determining whether said configured transmittance pattern matches a predetermined pattern illustrating a shift of the radiation source to a left, right, lower or upper side; and a correction unit that corrects, when the positional deviation detail of the radiation source is detected by the detection unit, according to the positional deviation detail at least one of the luminance data of the radiation detected by the first and second radiation detectors (30, 40). a conveyor unit that conveys a subject to be inspected in a predetermined direction; a radiation source that irradiates the conveyor unit with a radiation directed so as to intersect a conveying direction caused by the conveyor unit; a first radiation detector that detects the radiation emitted from the radiation source in a first energy range; a second radiation detector that detects the radiation emitted from the radiation source in a second energy range higher than the first energy range; a first calculation unit that calculates from luminance data of the radiation detected by the first radiation detector a value indicating a first transmittance in the first energy range of the radiation transmitted from the radiation source through the subject; a second calculation unit that calculates from luminance data of the radiation detected by the second radiation detector a value indicating a second transmittance in the second energy range of the radiation transmitted from the radiation source through the subject; a detection unit that detects a positional deviation detail of the radiation source according to a ratio or difference between the value indicating the first transmittance calculated by the first calculation unit and the value indicating the second transmittance calculated by the second calculation unit by computing a transmittance pattern constituted by an assembly of ratios or differences of values indicating the first and second transmittances and determining whether said configured transmittance pattern matches a predetermined pattern illustrating a shift of the radiation source to a left, right, lower or upper side; and a correction unit that corrects, when the positional deviation detail of the radiation source is detected by the detection unit, according to the positional deviation detail at least one of the luminance data of the radiation detected by the first and second radiation detectors (30, 40).