The Nikkei average closed up 1.65 percent at 39,584.58, after having hit 39,615.59 in intraday trading, a level last seen on January 31.
The broader Topix index settled 0.81 percent higher at 2,804.69. Advantest, Tokyo Electron and SoftBank Group surged 4-6 percent.
Automakers ended mostly lower as Japan's top trade negotiator Ryosei Akazawa reiterated that U.S. auto tariffs are unacceptable and it is in the national interest to protect the auto industry.
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