Japan's benchmark Nikkei stock index, the 225-issue Nikkei Stock Average, ended up 241.54 points, or 0.61 percent, from Thursday at 39,583.08.
The broader Topix index, meanwhile, finished 15.93 points, or 0.57 percent, higher at 2,809.63.
The yen tumbled to hit a fresh 37-year low in the lower 161 range against the U.S. dollar Friday in Tokyo, the Japanese currency's weakest since December 1986.
As the yen weakened further against the dollar, Japanese equities extended their gains, analysts said. A weaker Japanese currency helps exporters as it inflates their repatriated profits.
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