Tokyo stocks opened 0.20 percent higher on Friday after the S&P index set another record close on Wall Street.
The Nikkei 225 index at the Tokyo Stock Exchange was up 31.85 points at 15,618.05 at the start, extending its winning streak to a 10th straight day.
The bullish mood on Wall Street and a firm dollar should help to stave off profit-taking, traders said.
The market remains short-term overheated, but buying of exporters on a weak yen should help keep stock prices generally well-supported, said SMBC Nikko Securities general manager of equities Hiroichi Nishi.
Still, investors may be reluctant to make big bets before a speech by Federal Reserve Chair Janet Yellen on Friday, he said.
The dollar was changing hands at 103.83 yen in early Asian trade, compared with 103.85 yen in New York Thursday afternoon.
The euro bought $1.3279 and 137.89 yen against $1.3280 and 137.91 yen in US trade.
The latest rally on Wall Street came as investors shrugged off geopolitical problems, cheered by fresh signs of strength in the US economy.
The broad-based S&P added 0.29 percent to hit a record 1,992.37, while the blue-chip Dow Jones Industrial Average gained 0.36 percent to 17,039.49.
The tech-rich Nasdaq Composite rose 0.12 percent to 4,532.10, its highest level in 14 years.
-- Dow Jones Newswires contributed to this article --