Besides, a weaker yen boosted the exporters' sentiment.
In the opening minutes after the morning bell, the 225-issue Nikkei Stock Average gained 174.67 points, or 0.82 percent, from Thursday to 21,461.69, Xinhua reported.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, added 14.03 points, or 0.88 percent, to 1,602.32.
Early gainers comprised mining, real estate and consumer credit-oriented issues.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)