Mr Macron officially became President when Laurent Fabius, chairman of the constitutional council and a former prime minister, read out the results of the election.
During the meeting, the predecessor of the young President of France, the 39-year-old Macron - told him some secret information, needed to control the nuclear forces of the country, and introduced in the course of current Affairs.
Macron won the election with 66% of the votes in the runoff against leader of the far right National Front party Marine Le Pen.
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.
Macron's first week will be busy.
In his inauguration speech, Macron vowed to support French people and businesses.
Emmanuel Macron promised "deep change" Sunday as he was inaugurated as France's youngest president ever.
Macron arrived at the Elysee Palace earlier and walked down a red carpet. They helped make Hollande the least popular French president in modern history.
He listed a range of challenges facing the country, from migration fluxes, to the "excesses" of global capitalism and terrorism.
After he was formally declared president at the Elysee Palace, 21 cannon shots were fired from across the Seine River at the Invalides monument, where Napoleon is entombed.
"The world and Europe need France now more than ever and they need a strong France with a sense of its own destiny".
A president who has said he is "neither of the right, nor of the left" pledged to "give back the French their self-confidence".
On Thursday Mr Macron's party announced a list of 428 candidates - majority political unknowns - to fight parliamentary elections in June that will determine his chances of putting his program into action.
Following the ceremony and military honors at the Elysee palace, Macron is slated to visit the Tomb of the Unknown soldier, at the Arc de Triomphe at the top of the Champs-Elysees Avenue, a tradition followed by France's newly-sworn-in leaders. Aides went out of their way to emphasise that the dark suit he wore cost about 450 euros or just under $500, and that the lavender outfit worn by his wife Brigitte had been loaned by fashion house Louis Vuitton.
Macron holds talks with Merkel in Berlin on Monday, a day after his inauguration, with the aim of stressing the importance of the relationship with Germany to relaunching the European project. He shook hands with Macron, who accompanied him to his auto and also applauded him.
Hollande's five years in power were plagued by a sluggish economy and bloody terror attacks that killed more than 230 people and he leaves office after a single term.