An X-ray Talbot imaging device includes: a plurality of gratings a subject platform configured to hold a subject a radiation generator configured to emit radiation a radiation flat panel detector configured to capture a moire image and a holding unit configured to hold a knee joint section on the subject platform, wherein the holding unit includes: a first holding section configured to hold a proximal side of the joint section a second holding section configured to hold a distal side of the joint section a pivot fixing mechanism capable of pivoting the first and second holding sections relative to each other and capable of fixing a relative pivot angle between the first and second holding sections and an angle adjustment mechanism configured to change an angle of the knee joint section with respect to an emission direction of radiation emitted from the radiation generator.
