As of 9:15 a.m., the 225-issue Nikkei Stock Average edged down 6.33 points, or 0.02 percent, from Monday to 29,119.90.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, lost 7.61 points, or 0.40 percent, at 1,910.54.
Real estate and precision instrument issues led notable decliners, while marine and air transportation issues comprised those that gained the most in the opening minutes after the morning bell.
As for the U.S. dollar-yen pairing, as markets opened here, the dollar was quoted at 108.20-21 yen compared with 108.04-14 yen in New York and 107.71-72 yen at 5 p.m. on Monday in Tokyo.
The euro, meanwhile, fetched 1.2078-2082 dollars and 130.69-70 yen against 1.2081-2091 dollars and 130.58-68 yen in New York and 1.2096-2099 dollars and 130.30-34 yen in late Monday afternoon trade in Tokyo.