Macron becomes France's youngest post-war leader and the first to be born after 1958 when President Charles de Gaulle put in place the Fifth Republic.
The ceremony of inaugurating the eighth president of France began at the Elysee Palace with a meeting with outgoing President Francois Hollande who transferred his powers to the victor of the presidential elections, Emmanuel Macron.
Macron, who was a candidate of The La Republique en Marche (REM, Republic on the Move), had scored a decisive victory over the far-right candidate, Front National leader Marine le Pen, in the presidential run-off on May.7.
He takes charge of a nation that, when the United Kingdom leaves the European Union in 2019, will become the EU's only member with nuclear weapons and a permanent seat on the UN Security Council. Mr Macron was Mr Hollande's former adviser, then his economy minister from 2014 to 2016, when Mr Macron quit the Socialist government to launch his own independent presidential bid. Emmanuel Macron took over as French president on Sunday, promising to heal the country's divisions and breathe new life into the European Union.
"President of the Republic", Fabius said while proclaiming Macron, 39, as the President.
Outgoing French President Francois Hollande, left, greets President-elect Emmanuel Macron before the handover ceremony, at the Elysee Palace in Paris, France, Sunday, May 14, 2017. Macron's direct predecessor Francois Hollande, a self-styled "Normal President", meanwhile came under fire for paying almost 10,000 euros a month to his hairdresser.
He also listed "the excesses of capitalism in the world" and climate change among his future challenges.More news: At least 74 countries affected in 'biggest ever' cyber attack
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After Macron was formally declared president, 21 cannon shots were fired from across the Seine River at the Invalides monument, where Napoleon is entombed.
"The world and Europe need France more than ever", Macron said in his first speech as French president. The two politicians went to the palace to hold talks behind the scenes.
Today Macron is expected to reveal the name of his prime minister, before flying to Berlin to meet German Chancellor Angela Merkel.
On Thursday Mr Macron's party announced a list of 428 candidates - a lot of them political unknowns - to fight parliamentary elections in June that will determine his chances of putting his program into action.
More than 230 people have died in France in attacks claimed by Islamic State over the past two years as the country has taken part in military action against the militant group that controls parts of Syria and Iraq.
The former investment banker, who had never contested an election before and only formed his centrist political movement a year ago, has vowed to shake up the country's political order and reinvigorate its economy.