As of 9:15 a.m., the 225-issue Nikkei Stock Average dropped 431.75 points, or 1.83 percent, from Dec. 30 to 23,224.87.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, lost 25.79 points, or 1.50 percent, at 1,695.57.
Marine transportation, securities house, and pulp and paper-oriented issues comprised those that declined the most in the opening minutes after the morning bell.
Tokyo markets were closed from Tuesday to Friday for the New Year holidays.
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