The 10-year JGB yield was down 1.5 basis points at minus 0.090 percent after touching minus 0.095 percent, its lowest since August 2016.

The 30-year yield was 2 basis points lower at 0.500 percent after brushing 0.490 percent, its lowest since November 2016.

Stocks across Asia retreated on Monday, tracking global peers, after weaker-than-expected US and European manufacturing data on Friday intensified fears of a global economic slowdown.

JGBs followed the latest trend in global government bond markets.

Germany's 10-year bond yield fell below zero percent for the first time since October 2016, on Friday amid fears about a widespread European slowdown.