Some parts of the region southwest of the capital, Tokyo, got up to 200 mm (7.8 inches) of rain in the 24 hours up to Saturday morning, the Japan Meteorological Agency said.
Winds at the center of the Typhoon Talas were blowing at about 65 kph (40 mph), with peak gusts of about 90 kph (56 mph), it said.
Power was cut to about 120,000 households, as of Saturday morning, according to the Chubu Electric Power Grid Co, and Central JR suspended some of its bullet trains services.
A man in his 40s was killed in a landslide, Kyodo reported, and a 29-year-old man was found dead after his car plunged into a reservoir. Police were investigating whether that death was caused by the typhoon.
Typhoon Nanmadol, one of the biggest storms to hit Japan in years, killed at least two people and brought ferocious winds and record rainfall to the west of the country on Monday.