Prime Minister Pedro Santana Lopes and his new Portuguese cabinet have been sworn in at a ceremony in Lisbon.
Santana Lopes (left) has formally taken over from Durao Barroso
Mr Santana Lopes replaces Jose Manuel Durao Barroso, who has been named head the European Commission in Brussels.
The Portuguese government continues being led by the centre-right Social Democrats, with the right-wing Popular Party as the junior partner.
However the reshuffled cabinet contains many new members, notably in the foreign and finance ministries.
During Saturday's ceremony Mr Santana Lopes, 48, said he would continue with the main policies of his predecessor - including his deficit-cutting measures.
But he added that he would pay closer attention to improving the lot of the poor.
"I am not here to look after the powerful," Mr Santana Lopes said.
The new prime minister is regarded as a populist, to the right of Mr Durao Barroso.
The new cabinet contains only six members of the previous government.
The new foreign minister is Antonio Monteiro, a career diplomat.
The new finance minister is Antonio Bagao Felix.
In a political career spanning more than two decades, Mr Santana Lopes has had little experience of government at national level.
Before becoming Lisbon mayor, his most senior post was as secretary of
state for culture between 1991 and 1994.