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Recently, the SAR interferometry become popular. The purpose in this study is to grasp the deformation at Niijima and Shikinejima by SAR interferometry. This paper mentions three features of the deformation at Mt. Miyatsuka in Niijima. (1)It is Shows the deformation approaching and away from the satellite. (2)There are the monotonic or unsteady deformation in approaching it. (3)Between the summer of 2015 and the summer of 2016, it is shows the conspicuous deformation in unsteady it.