Tokyo's benchmark Nikkei index soared nearly five percent on Tuesday, buoyed by rallies on Wall Street and hopes for a massive infrastructure plan in the US.
The Nikkei 225 index rose 4.88 percent, or 1,051.26 points, to close at 22,582.21, while the broader Topix index was up 4.09 percent, or 62.67 points, to 1,593.45.
Tokyo shares opened sharply higher as investors took heart from a gain on Wall Street following the announcement of fresh Federal Reserve emergency lending to support the struggling US economy.
"The Japanese market is rising following rallies in US shares" after the Fed news, said Toshiyuki Kanayama, senior market analyst at Monex.
Tokyo shares spiked higher in late trading as US futures pointed to a positive opening following a report the Trump administration was preparing a sizable infrastructure proposal, brokers said.
"Today's gain does not necessarily mean a full recovery in the Tokyo market," said Shinichi Yamamoto, a broker at Okasan Securities in Tokyo.
"It's part of short-term adjustment moves but market sentiment is not bad at all," Yamamoto told AFP.
The dollar fetched 107.50 yen in Asian afternoon trade, against 107.37 yen in New York late Monday.
The Bank of Japan on Tuesday ramped up aid for businesses struggling with the fallout from the coronavirus pandemic, but "its impact on the market was limited", Yamamoto said.
In Tokyo, major shares were higher across the board, as Toyota jumped 4.79 percent to 7,021 yen with Sony gaining 2.22 percent to 7,480 yen.
Chip-making equipment manufacturer Tokyo Electron surged 5.43 percent to 23,070 yen with Canon up 4.24 percent at 2,283 yen.
Banks were also among winners as Mitsubishi UFJ Financial jumped 4.87 percent to 450 yen with Sumitomo Mitsui up 4.60 percent at 3,248 yen.
SoftBank Group gained 2.79 percent to 5,042 yen after the telecom and investment giant said it was considering selling its T-Mobile shares as part of plans to buy back its own stocks and reduce debts.