TOKYO, Oct 5 (Reuters) - Japan's 30-year government bond yields rose on Wednesday, as investors sold debt after the central bank's announcement last week over increasing bond purchases in the current quarter lifted bond prices.
The 30-year JGB yield was up 1.5 basis points at 1.330%, after hitting 1.300% in the previous session, its lowest since Sept. 22.
The BOJ on Friday surprised investors by doubling its planned purchases of JGBs with 10- to 25-year maturity in October-December period from the previous quarter.
"An upcoming auction may weigh on the price of the 30-year bonds, but at the same time the effect of the BOJ's announcement has expired," said Naka Matsuzawa, chief strategist at Nomura Securities.
The 20-year JGB yield fell 0.5 basis point to 0.940%.
The 10-year JGB yield was flat at 0.245%, after closing at 0.225% in the previous session, as the benchmark issue has been changed to the 358th bond.
The two-year JGB yield fell 0.5 basis point to -0.070%.
The five-year yield was flat at 0.035%.
The 40-year JGBs were not traded and the yield stayed at 1.495%.
Benchmark 10-year JGB futures fell 0.03 point to 149, with a trading volume of 10,335 lots. (Reporting by Junko Fujita)