The 225-issue Nikkei Stock Average gained 184.50 points, or 0.84 percent, from Friday to close the day at 22,062.39, marking its highest closing level since Feb. 26.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, added 5.08 points, or 0.32 percent, to finish at 1,568.75.
Securities house, electric power and gas, and electric appliance-related issues comprised those that gained the most by the close of play.
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