PROBLEM TO BE SOLVED: To improve a lengthy image joined with a plurality of images.SOLUTION: This X-ray diagnosis device 10 comprises: an X-ray irradiation unit 1 an X-ray detection unit 2 a joining position-setting unit 32 which sets a position at which the plurality of images are joined by being overlapped with one another at a part of each image a pixel position correction unit 33 which corrects a pixel position of an overlapped region included in at least one image and a lengthy-image creation unit 34 which creates the lengthy image which is joined in the overlapped region at which the correction is performed. The lengthy image is outputted to an output device 4 which is composed of a monitor or the like.COPYRIGHT: (C)2012,JPO&INPIT【課題】複数の画像を接合した長尺画像の画像向上を図る。【解決手段】X線診断装置10は、X線照射手段1と、X線検出手段2と、複数の画像を、各画像の一部分を重ね合わせて接合する位置を設定する接合位置設定手段32と、少なくとも一方の画像に含まれる重ね合わせ領域の画素位置を修正する画素位置修正手段33と、複数の画像を、前記修正が行われた重ね合わせ領域において接合した長尺画像を作成する長尺画像作成手段34と、を備える。その長尺画像をモニタ等からなる出力装置4に出力する。【選択図】図1