Public debt management is one of the basic fiscal functions the government performs. Public debt usually comprises a large share of nation's gross domestic product and is therefore an important instrument of fiscal policy. The purpose of this paper is to shed light on public debt management in Slovenia. Our goal was to estimate and present effects of debt management transactions performed by Slovenian Debt management office from year 2002 onwards. We found that these transactions had significant and positive effects on costs of public debt and also on its dynamics: they caused the turn in interest payments' trend and lowered the dynamics of upward-sloping trend of public debt.