This chapel is dedicated to the "Sacré-coeur". The altar is carved from white stone. The chapel contains several statues. These include the Sacré-coeur and statues of saints Peter and Paul by the sculptor Valentin. The chapel windows depict the last supper and the passion as well as the "Apparition de Marguerite-Marie". The stained glass was the work of the artist Ely in 1874. By a corner of the altar, there is a credence set into the wall. The chapel contains the tomb and cenotaph of Monseigneur l'Abbé Brignon.