Demand for the issue amounted to RON558 million and the ministry upsized allocation from its RON200 million target.
Romania last sold September 2031 bonds in May at an average yield of 4.77%.
Romania's finance ministry on Thursday raised 339.5 million lei (EUR70.15 million) selling treasury bonds maturing in September 2031 at an average yield of 4.22%, central bank data showed.