The present invention relates to an X-ray collimator which can control an irradiation area of the X-rays during X-ray imaging, and an X-ray imaging apparatus using the same, the apparatus comprising: an X-ray light source unit for radiating X-rays； an X-ray detection unit for detecting the X-rays； and a collimator which provides an opening for determining an irradiation area of the X-rays between the X-ray light source unit and the X-ray detection unit, wherein the opening has a first edge of an entrance side facing the X-ray light source unit and a second edge of an exit side facing the X-ray detection unit, and at least one of the first edge and the second edge has a curved shape.
