The Nikkei index of the Tokyo Stock Exchange, which began the day Monday with a loss of 1%, went back a few minutes later, although the level of the yen could still make investors cautious.
Forty minutes after the opening, the Nikkei of 225 blue chips gained 0.3% (about 41 points) at 12,728 points.
At the same time, the broader Topix index came up from 0.92% to 1066 points.
The dollar was changing while still below 95 yen, but the euro was back above 126 yen, and both tended to rise vis-à-vis the yen, a good direction for the Japanese firms selling abroad.
The contractors have also apparently digested lower on Wall Street Friday, a decrease in mechanical and partly due to slightly worse than expected economic indicators, dealers said.