Tokyo's benchmark Nikkei index rose for a fourth straight session on Friday helped by a cheaper yen against the dollar and extending rallies in global stocks which shrugged off a US-China tariff row.
The Nikkei 225 index gained 0.85 percent or 190.95 points to close at 22,601.77, rising 1.49 percent over the week.
The broader Topix index was up 0.65 percent or 10.98 points at 1,709.20. Over the week, it advanced 0.69 percent.
The dollar crept higher, changing hands at 111.37 yen in early Asian trade, against 111.23 yen in New York and 110.85 yen in Tokyo on Thursday.
"The dollar strengthened after fresh exchanges of tariffs between the US and China and this provides a tailwind for Japanese shares," Yoshihiro Ito, chief strategist at Okasan Online Securities, said in a commentary.
Investors were mainly on the sidelines however, ahead of a speech by US Federal Reserve chief Jerome Powell at a central bank gathering in the US city of Jackson Hole later Friday, he added.
"Players are waiting for Powell's speech, which is expected to be in line with the Fed's rate hike roadmap," said Toshikazu Horiuchi, a broker at IwaiCosmo Securities.
"They will also keep an eye on the prospect for US-China negotiations as well as President (Donald) Trump's tweets ahead of elections," Horiuchi told AFP.
In Tokyo, some blue-chip exporters were higher, with Sony trading up 1.18 percent at 6,055 yen, Panasonic higher by 0.07 percent at 1,346 yen and game giant Nintendo up 1.25 percent at 37,870 yen.
Steelmakers were lower, with Nippon Steel Sumitomo Metal trading down 1.34 percent at 2,242 yen and its rival JFE lower by 1.52 percent at 2,416.5 yen.
Automakers were mixed as Toyota rose 0.41 percent to 6,830 yen but Honda dropped 0.84 percent at 3,290 yen.