Tokyo stocks opened 0.70 percent higher on Wednesday following gains on Wall Street as investors anxiously await the outcome of a Federal Reserve policy meeting.
The Nikkei 225 index at the Tokyo Stock Exchange gained 99.88 points to 14,411.55 at the start.
The Fed is to wrap up a two-day policy meeting Wednesday with high expectations that it will start reeling in its massive stimulus plan.
"Most investors expect some kind of start to the tapering of the central bank's $85-billion-a-month bond-buying programmes," said Monex market analyst Toshiyuki Kanayama.
"A modest paring back is the most likely scenario, but few players are willing to place significant bets in any one direction," he told Dow Jones Newswires.
US stocks Tuesday closed higher amid greater investor confidence that the US economy could withstand an expected reduction of Fed bond purchases.
The Dow Jones Industrial Average put on 0.23 percent to 15,529.73.
The euro was lifted Tuesday by strong German economic data, but traders avoided big bets ahead of the Fed decision.
The euro was at $1.3354 and 132.41 yen in early Wednesday against $1.3356 and 132.38 yen in New York Tuesday afternoon.
The dollar was quoted at 99.16 yen against 99.14 yen.