The 225-issue Nikkei Stock Average lost 80.19 points, or 0.35 percent, from Friday to 22,616.23.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, dropped 5 points, or 0.32 percent, at 1,568.85.
Air transportation, mining and land transportation issues comprised those that declined the most by the morning break.
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