The coastal forest of the northeast region of Japan's Honshu island was seriously damaged by the tsunami caused by the Tohoku Earthquake on 11 March 2011. In this study, we examined the possibility of identifying the damage level of the coastal forest using middle spatial resolution satellite data ALOS/AVNIR-2 and TERRA/ASTER. Two types of damage, direct damage immediately after the tsunami and 'Akagare' damage that progress after the tsunami, were investigated. Using unsupervised classification, we classified the damage to the coastal forest by the tsunami into four stages. The level of damage by 'Akagare' and the recovery process were estimated using the NDVI in this paper.