The Topix added 0.3 percent to 1,644.98 as of 9:01 a.m. in Tokyo. The Nikkei 225 Stock Average gained 0.3 percent to 20,322.13.
The Federal Reserve concludes a two-day meeting Wednesday, with officials and Chair Janet Yellen expected to leave interest rates unchanged after the economy contracted in the first quarter amid harsh winter weather. Policy makers anticipate growth will rebound enough to potentially allow for a rate increase this year. The Bank of Japan also reviews borrowing costs this week.
Source : Bloomberg