To while avoiding an increase in size due to a cooling unit in the X-ray detector, to suppress the temperature rise of the X-ray detector, the X-ray irradiation means for irradiating X-rays, the X-rays transmitted through the object In X-ray imaging apparatus having an X-ray detector for outputting image data by detecting, and a control unit for controlling the X-ray detector and the X-ray irradiation means, and shooting the X-ray imaging of the subject I have, and a power unit stopping power which supplied or introduced into the X-ray detector and camera shooting detecting means for detecting the ready state, the power corresponding to the detection result of the camera shooting detecting means.X線検出器に冷却ユニットを備えることによる大型化を回避しつつ、X線検出器の温度上昇を抑制する為に、X線を照射するX線照射手段と、被検体を透過した前記X線を検出して画像データを出力するX線検出器と、前記X線照射手段及びX線検出器を制御する制御部と、を有するX線画像診断装置において、前記被検体のX線撮影における撮影準備状態を検出する撮影準備状態検出手段と、前記撮影準備状態検出手段の検出結果に応じた電源を前記X線検出器に投入又は投入した電源を停止させる電源投入部と、を有する。
