As of 9:15 a.m., the 225-issue Nikkei Stock Average shed 28.84 points, or 0.12 percent, from Monday to 24,054.67.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, edged down 0.98 point, or 0.06 percent, at 1,743.18.
Mining, iron and steel, and air transportation-linked issues comprised those that declined the most in the opening minutes after the morning bell.
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