The copter came down an hour after takeoff while on a mission to monitor a route in the mountains that had been opened for climbers.
The Kyodo News Agency reported, citing local officials, that the helicopter left the Gunma prefecture at around 09:15 a.m. local time (0:15 GMT) to examine the route on the borders of the nearby Nagano and Niigata prefectures and was supposed to return an hour and a half later.
The helicopter was found in the Gunma prefecture north of Tokyo. The Defense Ministry said eight people had been found near the wreckage, one was missing.
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On Saturday, authorities said they had discovered the ninth person, according to the Kyodo news agency. Doctors who examined the bodies said there were no survivors.
