Tokyo stocks opened 1.53 percent higher on Monday, tracking a jump in US stocks, while investors were buying on dips in early trade following a sharp decline last week.
The benchmark Nikkei 225 index, which lost 4.80 percent the previous week, rose 225.49 points to 15,003.86 at the start.
On Friday Wall Street stocks pushed higher, despite US air strikes in Iraq as investors ramped up buying in a market that some analysts said had been oversold.
The Dow Jones Industrial Average jumped 1.13 percent to 16,553.93, while the broad-based S&P 500 gained 1.15 percent to 1,931.59.
The dollar was at 102.12 yen in early Tokyo trade, compared with 102.06 yen in New York late Friday.
The euro bought $1.3403 and 136.87 yen against $1.3416 and 136.93 yen.