Herein disclosed an image processing device including: per-block motion vector calculating means for calculating a motion vector between two pictures of an image input in picture units sequentially, performing block matching in each of divided regions obtained by dividing one picture into a plurality of regions, and calculating a per-block motion vector for each of said divided regions; translation amount calculating means for calculating an amount of translation of the other of said two pictures with respect to one of said two pictures from a plurality of said per-block motion vectors calculated by said per-block motion vector calculating means; rotation angle calculating means for calculating a rotation angle of the other of said two pictures with respect to one of said two pictures from the plurality of said per-block motion vectors calculated by said per-block motion vector calculating means; and rotation and translation adding means for superimposing a plurality of pictures on each other using the amount of translation calculated by said translation amount calculating means and the rotation angle calculated by said rotation angle calculating means.