Villefranche-sur-Mer is a commune . It is found in the region Provence-Alpes-C Ã te d'Azur in the Alpes-Maritimes department in the south of France .
Villefranche-sur-Mer ( NiÃ ard : Vilafranca de Mar , ) is a commune in the Alpes-Maritimes department in the Provence-Alpes-C Ã te d'Azur region on the French Riviera .