As of 9:15 a.m., the 225-issue Nikkei Stock Average dropped 126.77 points, or 0.56 percent, from Monday to 22,657.97.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, lost 4.83 points, or 0.31 percent, at 1,568.19.
Farm and fishery, air transportation and land transportation issues comprised those that declined the most in the opening minutes after the morning bell.
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