This paper contributes empirically to the long-debated issue of the legitimacy of the European Central Bank (ECB) with regard to European polities. Using micro-level data from the Eurobarometer survey, we shed light on the socio-demographic determinants of public-opinion support for the ECB. We find that people with higher level of education and income and centre to right-wing political orientation tend to support the ECB, as well as people with optimistic expectations on the economic situation. By contrast, the unemployed tend to distrust the ECB. The policy relevance of such results is important for ECB's communication strategy with the general public.