The landslides killed at least 27 people, including a 2-year-old boy who was buried alive, authorities said.
At least 10 others are missing. Authorities fear the number could be much higher since the landslides hit a crowded residential area.
Among the missing is the 11-year-old brother of the boy who died.
Heavy rains have pounded the area. In the last 24 hours, it received a record 9.5 inches of rain, the Kyodo news agency said.