As of 9:15 a.m., the 225-issue Nikkei Stock Average lost 45.09 points, or 0.19 percent, from Friday to 23,978.01.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, shed 0.26 point, or 0.01 percent, at 1,739.72.
Mining, rubber product and precision instrument-linked issues comprised those that declined the most in the opening minutes after the morning bell.
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