Intense volcanism and landform changes have occurred during the post-caldera stage of the Kutcharo caldera in Hokkaido, westernmost Kuril volcanic arc, since approximately 40 ka.　Pyroclastic flow deposits formed plateaus, which originated in the Atosanupuri and Mashu calderas, close to the Kutcharo caldera, and then river blockages caused by those deposits, namely, the notable outflows of the Atosanupuri pumice （Ap:20-23 ka） and Mashu f tephra （Ma-f:7.6 ka）, occurred on the channel of the Kushirogawa River, which flows from the Kutcharo-ko Lake, and the blockages induced lake-level rise.　The lake-level fluctuation and sediment supply of reworked pyroclastic flow deposits resulted in the formation of respective terrace surfaces around the lake and along the rivers. From the detection of specific-surface deformation, we are able to clarify remarkable uplift rates on the west of the Atosanupuri caldera, that is, about 2 m/kyr during the past 20,000 years in the eastern coastal area of the lake.　Additionally, several normal faults, related to the deformation, are discernible.　In particular, the vertical slip rates exceeding 1 m/kyr are calculated in parts of the faults, on the basis of displacement of the terrace surfaces.