Christian Estrosi, the deputy mayor of Nice, said the security guards would be deployed alongside local police officers to protect voters this Sunday.
It comes after on Tuesday it emerged two radical Islamists had been planning an attack in the run-up to Sunday’s presidential vote.
Counter-terrorism officials are still investigating the attackers’ possible targets, but it is widely suspected that they had planned to hit a crowded polling station.
PRIVATE security guards have been hired to guard Nice's 252 polling stations
The foiled plot also threatened centre-right presidential hopeful François Fillon.
Mr Estrosi said: “The extra security officials have been sent to protect the town’s 252 polling stations to ensure the security of Nice voters. They will be there to assist local police officials deployed by the government.
Centre-right presidential hopeful François Fillon
“Tuesday’s arrest show that the French presidential election is a high-risk event. The terrorist threat has reached unprecedented heights and in the context of heightened security concerns across France, no threat can be ignored. We must also be prepared to tackle violence by extremist groups.”
The terror fears come almost a year after the French Riviera town was hit by a horrifying Islamic State (ISIS) attack.
Live images: Terror at French election
Tue, April 18, 2017
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Members of the French RAID police unit leave after searching the home of one of two men arrested in Marseille on April 18, 2017 after they were suspected of plotting an
The terror fears come almost a year after Nice was hit by an ISIS attack which killed 86 people
A truck rammed into a crowd in Nice celebrating Bastille Day on July 14, killing 86 and injuring scores more.
The first round of France’s presidential election will be held this Sunday April 23.
The two candidates with the most votes will then face each other in the final round runoff, which is to be held on May 7.