By Agence France-Presse
The benchmark Nikkei 225 index gained 0.30 percent or 66.03 points to close at 22,373.09, while the broader Topix index was up 0.20 percent or 3.30 points at 1,687.61.
Tokyo shares initially opened fractionally lower, extending falls on Wall Street last week.
But they ended in positive territory "as bargain-hunting emerged following the recent loss," said Toshikazu Horiuchi, a broker at IwaiCosmo Securities.
"But buying sentiment is not strong as concerns over the US-China trade war are weighing on the market," Horiuchi told AFP.
"Nervous trading is expected to continue for now," he added.
The dollar fetched 110.95 yen in Asian afternoon trade, down from 111.02 yen in New York late Friday, when world equities stumbled on worries over the US-China trade war after a threat of fresh tariffs by President Donald Trump.
Sony rose 0.24 percent to 6,245 yen and Nintendo gained 0.28 percent to 38,640 yen.
Fast Retailing, the Uniqlo casual wear operator and market heavyweight, was up 0.16 percent at 53,990 yen.
But electronic parts maker Rohm was down 1.15 percent at 9,390 yen and chip testing devices maker Advantest slumped 2.41 percent to 2,387 yen.
Toyota edged down 0.03 percent to 6,594 yen, losing its early gains after it said it was preparing to resume production at its quake-hit plant in Hokkaido.
In New York on Friday, the Dow ended down 0.3 percent with the Nasdaq also down 0.3 percent.