Tokyo stocks rose 0.18 percent Wednesday morning, tracking a rally on Wall Street after weak US jobs data raised expectations that the Federal Reserve will keep its stimulus programme in place.
The Nikkei 225 was up 26.67 points at 14,739.92 by the break, although the benchmark index pared earlier gains as the dollar weakened against the yen.
The Topix index of all first-section shares added 0.27 percent, or 3.23 points, to 1,217.67.
The US Labor Department said Tuesday its non-farm payroll report -- delayed by more than two weeks due to the US government shutdown -- showed 148,000 jobs were added in September, below forecasts for a gain of 180,000.
On Wall Street the Dow rose 0.49 percent, the S&P 500 -- already at a record high -- tacked on 0.57 percent and the Nasdaq climbed 0.24 percent.
While the figures were not depressing, analysts said they suggest the Fed will hold off winding down its bond-buying scheme until the economy shows better signs of improvement, weighing on the dollar.
By midday in Tokyo the greenback had sunk to 97.88 yen, from 98.12 in New York Tuesday afternoon.
"Although slower US economic recovery and prolonged monetary easing will depress a rise in the dollar, the current dollar level is high enough to boost expectations for upward revisions of corporate earnings," Hiroichi Nishi, general manager of equities at SMBC Nikko Securities, told Dow Jones Newswires.
Japan's earnings seasons gets into full swing next week with Sony, Panasonic and Honda among the firms reporting their fiscal half-year results.