The 30-year JGB yield fell 0.5 basis points to 0.600 percent on bargain-hunting after it had risen to a two-week high of 0.610 percent.

The 20-year JGB yield was steady at 0.42 percent.

By contrast, the benchmark 10-year JGB yield rose 0.5 basis point to minus 0.025 percent while The five-year JGB yield rose 0.5 basis point to minus 0.160 percent.

The benchmark two-year JGB yield rose 1 basis point to minus 0.155 percent, its highest since mid-January.

The auction of 2.1 trillion yen two-year government bonds produced weaker-than-expected results, with the auction's tail -- the gap between the lowest and average prices -- widening to 0.006 from 0.002 in the previous tender.

Bid-to-cover also dropped to 5.27 times from 6.07 in January.

The yield curve flattened, with the spread between two- and 20-year yields at 57.5 basis points, matching two-year lows hit earlier this month. It has shrunk from over 80 basis points in November.

Ten-year JGB futures fell 0.06 points to 152.74, with a trading volume of 26,153 lots.