The south porch, with its decorative sculptures, is one of the oldest parts of the church; the nave bears the date 1628, while the choir is an addition from 1740. Certain columns and arches are reminiscent of elements from Kérinec Chapel. Saint Cadoan lived in the 5th century AD and was a disciple of Saint Guénolé. This church is listed as an Historic Monument.
Outside, you can see a large stone cross monument, whose base is decorated with the Veil of Veronica.