The building has a single nave with no roof. The main chapel has a trapezoidal, eight-sided cross vault. There is a pointed triumphal arch and, on the Gospel side of the ante-chancel, a semicircular arch with a richly decorated archivolt. There is also an opening with a segmental arch. In front of the triumphal arch, there is another slightly pointed one, in which one can barely see the remains of a pictorial inscription reading: DXXVIII. The little doorway is from the 18th century.