1. An X-ray inspection apparatus for picking up images of X-rays transmitted from directions that vary with inspection object areas of an object by using a plurality of detector planes, to perform reconstruction processing of an image of the inspection object areas of said object, comprising: an X-ray detector for picking up images in a plurality of detection positions; detector drive means for moving said X-ray detector to each of said plurality of detection positions; X-ray output means for scanning a focal point and outputting an X-ray; a plurality of said X-ray detectors; movement means for independently moving said X-ray detectors to said image pickup positions; and control means for controlling operation of said X-ray inspection apparatus, said control means comprising: image acquisition control means for controlling exposure timing of said X-ray detector and said detector drive means; X-ray output control means for controlling said X-ray output means; and image reconstruction process means for reconstructing image data on the plurality of inspection object areas based on data about intensity distribution of the X-rays transmitted through said inspection object areas and picked up by said plurality of detector planes, wherein said image acquisition control means and said X-ray output control means cause said X-ray detector to stop in one of a plurality of image pickup positions, and cause scanning of a focal point of said X-ray output means such that X-rays successively transmitted through said plurality of inspection object areas enter the X-ray detector in that image pickup position and cause image pickup for the different inspection object areas, and wherein said image acquisition control means and said X-ray output control means cause one of said plurality of X-ray detectors to stop in one of the plurality of image pickup positions, and cause performing of a process of scanning a focal point of said X-ray output means such that X-rays successively transmitted through said plurality of inspection object areas enter the X-ray detector in that image pickup position and causing image pickup for the different inspection object areas in parallel with a process of moving another X-ray detector different from said X-ray detector picking up images to another one of said plurality of image pickup positions.