The present invention relates to a variable pinhole collimator and a radiographic imaging device using same, in which the variable pinhole collimator includes: a plurality of pinhole plates formed in each plate surface thereof with a plurality of pinhole formation holes having different sizes along a circumferential direction, formed in each plate surface thereof with a plurality of rotation operation holes around the rotation axis along the circumferential direction, and configured to be laminated in an incidence direction of radiation； and a driving module inserted into the rotation operation holes of the plurality of pinhole plates in the incidence direction to rotate the plurality of pinhole plates about the rotation axis, and configured to rotate the plurality of pinhole plates to form a pinhole in the overlapping area. Accordingly, various pinhole shapes can be achieved since it is possible to change parameters constituting a pinhole of the pinhole collimator.
