The church has a single vessel nave, covered by a barrel vault articulated in three bays with transverse arches. The nave walls are made of rubble and are pierced with high-set narrow windows whose tops are formed on the outside with single stones. There is a blocked portal with triangular lintel of an archaic type (sometimes called "Auvergnat") in the south wall. In the interior a longitudinal mural arcade of ashlar masonry appears to have been inserted forming an armature to support the barrel vault. The arches of this armature impinge upon the tops of the windows. Despite this armature and added buttresses on the exterior the nave barrel vault is heavily distorted and tied with iron tirans.