 As a priest, he served as chaplain to Careggi University Hospital in Florence from 1975 to 1976 and assistant to young university students in the Convent of Pisa from 1979 to 1980.He also was vice director of theologians, assistant of the Secular Franciscan Order and of the Franciscan Youth of Montughi (Florence), vicar of the parish of St. Francis and St. Clare in Montughi from 1984 to 1988, and professor of church history at the Theological Faculty of Central Italy starting in 1988.Roncari was nominated as the pastor of the parish of St. Francis and St. Clare in Montughi in 1992.