"I, as president, swear upon my honour and integrity before the great Turkish nation and history to safeguard the existence and independence of the state ... to abide by the constitution, the rule of law, democracy, the principles and reforms of Ataturk, and the principles of the secular republic," Erdoğan said in a ceremony at the parliament in Ankara, which was broadcast live on television.
The inauguration in parliament will be followed by a lavish ceremony at the Beştepe palace in the capital Ankara attended by dozens of world leaders.
Recep Tayyip Erdoğan won 52.18 percent of the vote while his rival Kemal Kılıçdaroğlu scored 47.82 percent, official results show.
