PROBLEM TO BE SOLVED: To easily confirm an imaging range.SOLUTION: An X-ray CT device according to an embodiment comprises an X-ray generating unit that generates an X-ray to be applied to a subject in a cone beam shape to have a predetermined width in the body axial direction of the subject, a detection unit having a plurality of rows of detection elements that detect the X-ray having passed through the subject, and a light projection unit that projects light to a position on the subject corresponding to a border of a detection range of the detection unit in the body axial direction of the subject.COPYRIGHT: (C)2015,JPO&INPIT【課題】撮影範囲を容易に確認可能とする。【解決手段】実施形態にかかるX線CT装置は、被検体に照射するX線を、被検体の体軸方向において所定幅となるコーンビーム状で発生するX線発生部と、被検体を透過したX線を検出する複数列の検出素子を有する検出部と、被検体の体軸方向における検出部の検出範囲の境界に対応した被検体上の位置へ光を投光する投光部と、を備える。【選択図】図1
