The Société des Bains de Mer (SBM; English: Society of Sea Baths), officially the Société Anonyme des Bains de Mer et du Cercle des Étrangers à Monaco (French: [sɔsjete de bɛ̃ d(ə) mɛʁ e dy sɛʁkl(ə) dez‿etʁɑ̃ʒez‿a mɔnako]; English: Society of Sea Baths and of the Circle of Foreigners in Monaco), is a publicly traded company registered in the Principality of Monaco. SBM owns and manages the Monte Carlo Casino, the Opéra de Monte-Carlo and the Hôtel de Paris in Monte Carlo.
The Opéra de Monte-Carlo is an opera house which is part of the Monte Carlo Casino located in the Principality of Monaco.
With the lack of cultural diversions available in Monaco in the 1870s, Prince Charles III, along with the Société des bains de mer, decided to include a concert hall as part of the casino. The main public entrance to the hall was from the casino, while Charles III's private entrance was on the western side. It opened in 1879 and became known as the Salle Garnier, after the architect Charles Garnier, who designed it.