Nikkei ended 1.28 percent higher Monday on the Bank of Japan's robust Tankan business report and the yen's slide.
The 225-issue Nikkei Stock Average closed up 175.18 points, or 1.28 percent, from Friday at 13,852.50.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange was up 16.86 points, or 1.49 percent, at 1, 150.70.
Almost all 33 sectors gained, led by securities, consumer finance and insurance firms, while mining was the only decliner.
The turnover was about 2,039.6 billion yen (about 20.54 billion U.S. dollars).