Tokyo stocks opened 0.39 percent higher on Wednesday with investor sentiment staying bullish after US shares closed at new all-time highs and despite worse-than-expected Japanese trade data.
The benchmark Nikkei 225 index was up 59.67 points to 15,440.69 at the start.
"Strong retail investor support for stocks is acting as a formidable buttress against large-scale profit-taking, and today is not likely to be any different," said an equity trading director at a foreign brokerage.
The Dow Jones Industrial Average ended up 0.34 percent at a record 15,387.58 points after a strong earnings report from Home Depot and as the market anticipates testimony in Congress by Federal Reserve chairman Ben Bernanke.
Bernanke will be watched on Wednesday for signs that the Fed might be ready to alter its quantitative easing (QE) policy, or project just when and how it might reel in its aggressive bond purchases.
Investor sentiment seemed unhurt although official data released just before the Tokyo market opening showed Japan's trade deficit in April expanded almost 70 percent on year to $8.6 billion as a weak yen pushed up import costs.
Currency rates hardly moved after the trade data.
The dollar was quoted at 102.42 yen in early Asian trade against 102.47 yen in New York late Tuesday.
The euro firmed to $1.2933 and 132.57 from $1.2906 and 102.47 yen in US trade.
-- Dow Jones Newswires contributed to this article --