Kammuri's fierce winds toppled trees and flattened flimsy homes across a swathe of the nation's north and forced evacuation of thousands of residents and the cancellation of hundreds of flights.
Authorities evacuated some 225,000 people ahead of the arrival overnight of Typhoon Kammuri, known locally as Tisoy.
Towns east of Tokyo that were still recovering from damage caused by Typhoon Hagibis earlier this month were hit by torrential rain that caused dangerous flooding and mudslides.
Typhoon Hagibis unleashed torrents of rain and strong winds that left thousands of homes on Japan's main island flooded, damaged or without power. Kyodo News service counted 36 deaths caused by the typhoon with 16 people missing.
Rugby World Cup matches, concerts and other events have been cancelled. Flights were grounded and train services halted.
The Japanese Grand Prix's entire Saturday track programme has been cancelled as powerful Typhoon Hagibis bears down on the Suzuka circuit. Two Rugby World Cup matches scheduled for the same day were also cancelled.
The storm hit southern parts of the country on Wednesday night, prompting flood warnings and triggering landslides in affected areas.
Typhoon Lekima made landfall early on Saturday in China's Zhejiang province, with winds gusting up to 187 kmh (116 mph). The centre of the storm has since travelled north through Shandong and off the coast.
The National Meteorological Centre warned that 24-hour rainfall levels across eastern China could reach around 250-320 millimetres from Friday afternoon to Saturday afternoon.
About 900 mm of rain has fallen on the southernmost main island of Kyushu since late June, with heavy rain forecast to continue into Thursday.
Officials say the casualties occurred when rain-triggered landslides collapsed homes in several provinces in central Philippines, adding 20 people still remain unaccounted for.
Typhoon Trami has already disrupted travel in the world's third-biggest economy, with bullet train services in the west of Japan suspended, over 1,000 flights cancelled due to the closure of a key airport and Tokyo's evening train services scrapped.
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