Yields on 20-year JGBs added half a basis point at 0.430% midway through the afternoon session, while 30-year bond yields gained 1 basis point at 0.685%.
Under a policy dubbed yield curve control, the BOJ targets short-term interest rates at -0.1% and the 10-year bond yield around 0%. It also buys risky assets such as exchange-traded funds (ETF) as part of efforts to fire up inflation.