In the first 15 minutes of Monday trading, the Nikkei Stock Average rose 339.93 points and was at 29,119.12.
The Tokyo Stock Price Index (TOPIX) rose 22.96 points on Monday morning, up to 1,913.91.
At the end of December, the Nikkei index broke the August 1990 record, reaching 27,292.37 points.
In November, the Nikkei index, which reflects the stock market performance of the 225 leading Japanese companies, surpassed the 26,000-point threshold for the first time in almost 30 years, amid positive coronavirus vaccine developments.