The Palazzo Carignano was once a private residence of the Princes of Carignano, after whom it is named. It is famous for its unique rounded façade.

The construction of the Palazzo Carignano was ordered by Emmanuel Philibert, son of Thomas Francis, Prince of Carignano and his French wife Marie de Bourbon. Construction started in 1679 when the Prince was 51 years of age.

The building, constructed in brick in a typical Baroque style, has an elliptical center façade. This facade offers the only domestic project to make use of the undulating 'concave – convex – concave' rhythm established by Francesco Borromini in the church of S. Carlo alle Quattro Fontane.
The Palazzo was the birthplace of the future princess de Lamballe in 1749 – confidant of Marie Antoinette and for whom she lost her life for in 1792. Charles Emmanuel, Prince of Carignano was born there in 1770. It was also the birth place of the first King of Italy, Victor Emmanuel II in 1820.
From 1848 to 1861 the palace was used for the House of Deputies of the Subalpine Parliament.
In 1861, with the creation of the parliament of the newly unified Kingdom of Italy, the room became too small to host the House of Deputies, which was moved elsewhere.