Emmanuel Macron becomes France's youngest ever president on Sunday, taking over from Socialist Francois Hollande in a solemn ceremony.
Macron, a 39-year-old centrist, arrived at the Elysee Palace in central Paris in a motorcade and walked down the red carpet under light rain to be greeted by Hollande for his inauguration.
The new president's wife Brigitte, a 64-year-old who was his high school drama teacher, arrived separately for the ceremony wearing a light blue Louis Vuitton outfit.
A week after his victory over far-right leader Marine Le Pen in a tumultuous election, Macron will have a private meeting with Hollande at which he will be given the codes to launch France's nuclear weapons.
He will then attend a ceremony in front of hundreds of politicians and invited guests at which the official election results will be read out.
At the end of the formalities, a 21-gun salute is to ring out from the Invalides military hospital on the other side of the River Seine.
Macron will then be driven to the Arc de Triomphe to lay a wreath at the tomb of the unknown soldier.
The new president faces a host of daunting challenges including tackling stubbornly high unemployment, fighting Daesh-inspired terrorism and uniting a deeply divided country.
Socialist 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.
The 64-year-old launched Macron's political career, plucking him from the world of investment banking to be an advisor and then his economy minister.
"I am not handing over power to a political opponent, it's far simpler," Hollande said on Thursday.
Security was tight with around 1,500 police officers deployed near the presidential palace and the nearby Champs Elysees avenue and surrounding roads were blocked off.
After a formal lunch, Macron will visit Paris's town hall, a traditional stop for any new French president in his "host" city.
Macron's first week will be busy. On Monday, he is expected to reveal the closely-guarded name of his prime minister, before flying to Berlin to meet German Chancellor Angela Merkel.
It is virtually a rite of passage for French leaders to make their first European trip to meet the leader of the other half of the so-called "motor" of the EU.
Pro-EU Macron wants to push for closer cooperation to help the bloc overcome the imminent departure of Britain, another of its most powerful members.
He intends to press for the creation of a parliament and budget for the eurozone.
In June, Macron faces what the French media are calling a "third round of the presidential election" when the country elects a new parliament in a two-round vote.
The new president needs an outright majority to be able to enact his ambitious reform agenda.
The year-old political movement "Republique en Marche" (Republic on the Move, REM) that he formed to launch his presidential bid intends to field candidates in virtually every constituency in the country.
It unveiled 428 of its 577 candidates this week, saying it wants to bring fresh faces into the National Assembly lower house of parliament.
Half of them have never held elected office, including a retired female bullfighter and a star mathematician, and half of them are women.
Unpopular Hollande was the first to bow to the rebellious mood in December as he became the first sitting president not to seek re-election in the French fifth republic, founded in 1958.
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