As of 9:15 a.m., the 225-issue Nikkei Stock Average added 300.29 points, or 1.03 percent, from Monday to 29,474.44.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, rose 10.89 points, or 0.55 percent, at 2,001.07.
Rubber product, electric appliance and metal product-linked issues comprised those that gained the most in the opening minutes after the morning bell.
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