In contrast to the rather stark façade, the interior, designed by de Rossi, is richly Baroque. There are two chapels on each side of the nave, in large niches with trabeated rather than arched tops. They are flanked on each side by rectangular piers revetted with giallo antico marble. A ribbed Corinthian pilaster is applied to each of these, in grey with gilded ribs and capitals; the capitals are duplicated for the tops of the rest of the piers. Above each of these chapels is an arched window.