PROBLEM TO BE SOLVED: To provide an image processing device capable of acquiring a three-dimensional model of a changed object by using less images to estimate change with high accuracy about the object that accompanies the change in shape.SOLUTION: The image processing device includes: a storage part 23 for storing a three-dimensional model M of an object at an arbitrary first time； a generation part 31 for acquiring an image including silhouette information of the object from an image obtained by photographing the object at a second time later than the first time, and generating a three-dimensional model for analysis on the basis of the silhouette information； and an analysis part 32 for retrieving correspondence places of the three-dimensional model and the model for analysis, displacing the correspondence places on the three-dimensional model in accordance with the correspondence places on the model for analysis, and updating the three-dimensional model as a shape of the object at the second time.SELECTED DRAWING: Figure 1
