A group of around 30 people believed to be members of the Greek anarchist group Rouvikonas (Rubicon) stormed the Finance ministry in the center of Athens.
The group entered the main entrance of the building at Nikis Street and reached the 6th floor where the office of Euclid Tsakalotos is located.
It is not clear whether the minister was in his office at the time.
The demonstrators threw leaflets against the austerity policies imposed by Tsakalotos and his team before leaving the building.
No arrests were made.
Correspondents say that the Finance ministry is supposed to be one of the most secured buildings in Athens.