The Nikkei Stock Average climbed to a 32-year high on Friday. The gains reflect rising investor confidence, lifted by robust earnings and improving forecasts at Japanese companies.
The index finished the day at 30,808. That's up 0.7 percent from Thursday, hitting its highest level since August 1990. It briefly rose 350 points.
The Nikkei 225 has been heading up for 7 straight trading days.
Many overseas investors are shifting money to Japanese shares amid concerns over slowing growth in the United States and Europe in the wake of interest-rate hikes.
Analysts say a weaker yen against the dollar is fueling the stock-buying by foreign investors in the Tokyo market.
Semiconductor-related shares were also strong. This came after global chipmakers announced plans to bring more of their operations to Japan.