Bronislaw Komorowski pledged to unite Poland after being sworn in Friday as the country's new president, succeeding Lech Kaczynski, who died in a plane crash in Russia in April, dpa reported
Komorowski, during a ceremony in Parliament, vowed to protect the constitution, to unite the nation across political lines and to modernize Poland's infrastructure.
In attendance were politicians, religious officials and other guests, including Lech Walesa, former president and leader of the anti-Communist Solidarity labour union, and Jerzy Buzek, the European Parliament president.
The swearing-in ceremony was followed by a moment of silence to honour the victims of the plane crash in which president Kaczynski and 95 others were killed.
Jaroslaw Kaczynski, head of the opposition Law and Justice party and the twin brother of the late president, did not attend the ceremony. Kaczynski lost to Komorowski in a runoff vote in July.
Komorowski is later to attend a mass at Warsaw Cathedral and a ceremony at Warsaw's Royal Castle, where he is to receive the Order of the White Eagle - the nation's highest honour.
He is then set to take up residence at Belweder Palace, where he will stay until renovations are completed at the presidential palace