As of 9:15 a.m., the 225-issue Nikkei Stock Average added 247.32 points, or 0.85 percent, from Friday to 29,424.02.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 11.26 points, or 0.57 percent, at 1,995.42.
Glass and ceramics product, nonferrous metal and electric appliance issues comprised those that advanced the most in the opening minutes after the morning bell.
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