French President Francois Hollande's Socialists won a resounding parliamentary majority on Sunday, strengthening his hand as he presses euro zone paymaster Germany to support debt-laden states weighed down by austerity cuts and ailing banks, Reuters reported.

The Socialist Party and its affiliates secured 307 seats in the parliamentary election runoff, according to the final count for mainland France, comfortably more than the 289 needed for a majority in the 577-seat National Assembly.

The left-wing triumph means Hollande, elected in May, won't need to rely on the environmentalist Greens, who won 16 seats, or the Communist-dominated Left Front, with 10 deputies, to pass laws. The centre-left already controls the upper house of parliament, the Senate.

"This gives power and a backbone to the government," said Finance Minister Pierre Moscovici, calling the result a vote of confidence in Hollande's government that would enable it to forge ahead with its economic and euro zone policies.

"Europe's future is at stake in the weeks ahead," he said.

The mainstream conservatives, who oppose Hollande's plans to raise taxes on the rich, won 224 seats.