Torrential rainfall in August 2022 induced more than 2,000 slope failures in the area between the Ogyu and Koshirakawa Rivers in Iide Town, Yamagata Prefecture. They mainly occurred on anti-dip slopes with a declination angle of around 30°, and some on dip slopes of around 25° turned into debris flows. Difference maps produced from the high-resolution DEMs before and after the 2022 rainfall in the northern part of the study area show that the layer thickness of most of the failures was less than 5m. Older shallow scars developed before the 2022 event are also observed. These are presumed to have been formed due to the 1967 Uetsu torrential rainfall.