The benchmark index for the Tokyo Stock Exchange ended Thursday sharply higher, one day after it climbed above the 30,000 mark for the first time since September 2021.
The Nikkei 225 finished at 30,573, up 1.6 percent from Wednesday. It was briefly up more than 570 points.
Foreign investors are helping drive the rally on concerns that interest-rate hikes could weigh on growth in the United States and Europe.
Market players snapped up shares after the US debt-ceiling impasse eased somewhat. President Joe Biden said he is confident America will not default on its debt.
The Nikkei 225 has risen for the last six trading days. It has been on an upward trend since late March, and is up 6 percent this month.