Around 50 people were on hand as Le Pen arrived at a shipping company in the western town of Dol-de-Bretagne, hurling eggs and shouting "out with fascists".
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None of the eggs hit their target as bodyguards hustled Le Pen, 48, into the building.
France's western Brittany region is not a stronghold of Le Pen's National Front, handing her only 15 percent of the vote in the April 23 first round of the election.
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Her centrist rival Emmanuel Macron, 39, scored 29 percent in the region.
The visit comes the day after Le Pen took on Macron in a bruising televised debate, with some two-thirds of viewers saying the younger candidate was the more convincing.
Macron is tipped to win Sunday's vote by a roughly 20-point margin.
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