This X-ray inspection device (10) is capable of detecting X-rays in a wide energy band while keeping manufacturing costs low, and comprises an X-ray irradiator (13), a line sensor assembly (14), and the like. The line sensor assembly (14) has a plurality of detecting units (41) and the like. Each detecting unit (41) has a scintillator (53), a detection body (52) having a plurality of elements disposed thereon, and a ceramic substrate (51) for supporting the scintillator and the detection body. In the line sensor assembly (14), the plurality of detection units (41) are the like are aligned in the front-to-back direction so that the scintillator (53) and the detection body (52) in the detection unit (41) or the like are aligned with the scintillators (53) and the detection bodies (52) in neighboring detection units (41) without gaps therebetween.