The 225-issue Nikkei Stock Average dropped 181.84 points, or 0.91 percent, from Friday to 19,715.42.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, lost 6.72 points, or 0.47 percent, at 1,435.82.
Precision instrument, nonferrous metal and construction issues comprised those that declined the most by the morning break.
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