French President Francois Hollande's Socialist Party has taken a solid majority in Sunday's runoff parliamentary elections.
Early polling results show the Socialists' bloc taking up to 320 seats in the 577-member National Assembly, well above the 289 needed for a majority.
The conservative UMP party of former president Nicolas Sarkozy was expected to win at least 212 seats. The anti-immigration National Front party of Marine Le Pen, which placed third in the first round, took at least two seats.
Voter participation was reported at 21.4 percent by midday Sunday, in the election which was France's fourth in eight weeks.
Analysts say the expected win will allow Mr. Hollande to enact measures he hopes will help curb unemployment and kick-start the eurozone's second-largest economy.
Mr. Hollande unseated conservative Nicolas Sarkozy in a May 6 runoff presidential election. The new president needs lawmakers' support for him to try to persuade European Union leaders, especially German Chancellor Angela Merkel, to focus on spurring economic growth rather than enforcing further austerity in struggling European economies.