Ibrahim Boubacar Keita has been sworn in as Mali's new president at the Supreme Court in the capital, Bamako.
易卜拉欣·布巴卡·凯塔在马里首都巴马科最高法院内宣誓担任新总统。
Ibrahim Boubacar Keita (R) promised to unify the country at his inauguration
Before he took his oath of office, transitional leader Dioncounda Traore handed over power at a ceremony inside the presidential palace.
Mr Keita, a former prime minister, won last month's run-off election.
The election of the new president is intended to restore normality after a coup and French-led military action against Islamist rebels in the north.
France sent more than 4,000 troops to Mali in January and together with West African troops regained control of towns and cities from groups aligned with al-Qaeda.
They captured territory with the backing of Tuareg separatists in 2012, taking advantage of a coup in Bamako during which the army accused the civilian government of not doing enough to repel the Islamists.
'Crazy challenge'
Mr Traore and defeated presidential candidate Soumaila Cisse were among the more than 1,000 politicians, diplomats and military personnel at Wednesday's inauguration, the AFP news agency reports.
"I will not forget for a moment that you put me where I am to take care of all aspects of the life of our nation," Mr Keita said after taking his oath of office.
The 68-year-old also reiterated that national reconciliation was his priority.
"I want to reconcile（调停） hearts and minds, restore true brotherhood between us so that all the different people can play their part harmoniously in the national symphony," he said.