Japan's benchmark Nikkei stock index, the 225-issue Nikkei Stock Average ended up 324.68 points, or 0.91 percent, from Friday at 35,901.79, its highest close since February 1990.
The broader Topix index, meanwhile, finished 30.37 points, or 1.22 percent, higher at 2,524.60, its highest level since March 1990.
Market watchers here pointed out that while buying fueled by favorable earnings from retailers on Friday pushed up the Nikkei, market sentiment here was also supported by speculation that Japan is on its way out of deflation.
Meanwhile, the market was also supported by a strong desire to buy, especially among individual investors, against the backdrop of the launch of the new Nippon Individual Savings Account (NISA), a Japanese government tax-free stock investment program.
On the top-tier Prime Market, gainers were led by marine transportation, securities house and electric power and gas issues.
Issues that gained outpaced those that declined by 1,299 to 321, while 36 ended the day unchanged.
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