Previous reports indicated that 13 people were killed in the disaster.
Rescue teams also found another body in the area hit by the mudslide but it is yet to be established whether the person's death was caused by the disaster, Kyodo added.
Some 1,300 police officers, firefighters and Self-Defense Forces are still searching the area of the landslide in hopes of finding all the people missing.
The powerful landslide descended on 3 July as a result of heavy rain along the Pacific coast of Japan. Over 35,500 people had to evacuate due to the high risk of new mudslides.