The win for Woods was his first in Japan and his first anywhere since winning the WGC-Match Play Championship in February. His last stroke play title came in October 2003 when he successfully defended his title at the WGC-American Express Championship.
Local favorite Ryoken Kawagishi fired a 5-under 65 to finish in second place at 8-under-par 272. PGA Tour player K.J. Choi, who hails from South Korea, also posted 65 to take third place at minus-6.
Woods kicked in a 2-foot birdie putt at the third to get his round going. He converted consecutive birdie tries from the eighth at Phoenix Country Club.
The World No. 2 picked up two bogies along the way, but birdies on 13 and 16 put him eight clear of the field.
This was Woods' fourth trip to Japan. He finished second at the 2001 World Cup, where he was teamed with David Duval. Woods finished eighth at this event two years ago and 15th at the Casio World Open in 1998. He has now won titles in 10 different countries worldwide.
Steve Conran closed with a 65 to take fourth place at 5-under-par 275. Japan's Hideto Tanihara and Daniel Chopra shared fifth place at minus-4.
Thomas Bjorn, the 2003 champion, jumped from a tie for 20th to seventh place with a final round, 6-under 64 to finish the event at 3-under-par 277.