Japan's key Nikkei 225 Stock Average rose more than 2 per cent Wednesday on the overnight rebound in the US market, dpa reported.
The Nikkei index rose 287.24 points, or 2.22 per cent, to 13,201.9.
The broader Topix index of all first-section issues was also up 22.22 points, or 1.78 per cent, to 1,269.93.
The Tokyo market sentiment was boosted in morning trading after the US Federal Reserve's assessment that US economic activity expanded in the second quarter helped an overnight rise on Wall Street.
On currency markets at 9 am (0000 GMT), the dollar was quoted at 108.30-35 yen, up from Tuesday's 5 pm quote of 107.81-82 yen.
The euro was quoted at 1.5462-67 dollars, down from Tuesday's 5 pm quote of 1.5498-5500 dollars, and at 167.52-57 yen, up from 167.09-13 yen.