The 225-issue Nikkei Stock Average added 296.80 points, or 1.74 percent, from Tuesday to 17,308.33.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 33.93 points, or 2.67 percent, at 1,302.39.
Chemical, marine transportation and precision instrument issues comprised those that gained the most by the morning break.
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