Taniguchi made five birdies, including one on the final hole, against two bogeys as he finished the tournament at 11-under 277 at the Kochi Kuroshio Country Club.
For Taniguchi, last year's Japan Open champion, it was his first title since the 2004 Bridgestone Open.
Michelle Wie, making her sixth start in a men's pro event, missed the cut by a stroke earlier in the tournament.
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