The bumper payment was made to the former manager of a store in the Brittany town of Guingamp, reported regional newspaper Ouest France.
The charge was made to cover four years of overtime payments as well as holidays the woman was owed.
"I worked regularly from 8am until midnight, seven days a week," she told the newspaper.
The woman was supported by her union, the CFDT, in the action.
A spokeswoman for the union said she was "put under enormous pressure and found herself under the total influence of the company, not even realising what was happening to her."
The decision is the first of its kind in France, although McDonald's is reported to have been hit with a fine of €50,000 in Japan in 2009 for non-payment of overtime.