The Nikkei average rose 0.55 percent to 39,678.02 despite lingering uncertainty over the upcoming upper house election outcome. The broader Topix index finished marginally higher at 2,825.31.
Chip-testing equipment maker Advantest gained 1.8 percent, Tokyo Electron rallied 3.5 percent SoftBank Group added 2 percent.
Japanese government bond yields surged, with the 30-year yield hitting a record high amid fiscal health concerns ahead of the nation elections on July 20.
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