PROBLEM TO BE SOLVED: To provide a mechanism which can efficiently perform comparison with time in the fundus oculi of an eye to be examined.SOLUTION: An image processing apparatus includes: an image acquisition part 110 which acquires the first image obtained by imaging a region in the prescribed size in the fundus oculi of an eye to be examined and the second image obtained by imaging a region narrower than the region in the prescribed region in association with each other for each set based on the imaging timing； a positioning part 141 which performs the first positioning being the positioning between the first image and the second image constituting the same set and the second positioning being the positioning between the first images included in the different sets to generate position information related to the positioning； and an overlapping part 142 which generates an overlapped image by overlapping the second image included in the first set and the second image included in the second set acquired after the first set with the first image included in the first set or the first image included in the second set on the basis of the position information generated by the positioning part 141.SELECTED DRAWING: Figure 1【課題】被検眼の眼底における経時比較を効率良く行える仕組みを提供する。【解決手段】被検眼の眼底における所定の大きさの領域を撮影して得られた第１の画像と、前記所定の大きさの領域よりも狭い領域を撮影して得られた第２の画像とを、撮影時期に基づくセット毎に対応付けて取得する画像取得部１１０と、同一のセットを構成する第１の画像と第２の画像との位置合わせである第１の位置合わせと、異なる複数のセットに含まれる第１の画像の夫々の位置合わせである第２の位置合わせとを行って、これらの位置合わせに係る位置情報を生成する位置合わせ部１４１と、位置合わせ部１４１で生成された位置情報に基づいて、第１のセットに含まれる第２の画像と第１のセットよりも後に取得された第２のセットに含まれる第２の画像とを、第１のセットに含まれる第１の画像又は第２のセットに含まれる第１の画像に重畳させて、重畳画像を生成する重畳部１４２を備える。【選択図】図１
