The main nave consists of a large space of divided into three naves, which in turn can be divided into 4 zones having as axis the pillars of the nave. Six pillars and the walls with pillars act as a buttresssupporting the vaults. The octagonal pillars reach, up to their capitals, a height of. The central dome is high. At the end of the nave, on the right side, different rooms are used by the parish and other services: daily chapel, sacristy and storage rooms.