Marcello Mastroianni as Franco

Richard Basehart as Paolo Martelli

Valentina Cortese as Marisa

Maurizio Arena as Roberto Santucci

Eloisa Cianni as Teresa

Irène Galter as Lisa

Andrea Aureli as Ivo

Armida De Pasquali as Wanda la 'fumettara'

Umberto Spadaro as Antonio

Checco Durante as Virgilio Santucci

Nino Musco as padre di Teresa e Ivo

Silvio Bagolini as collega di Franco

Luigi Tosi as capocantiere

Mimo Billi as capomastro

Liana Ferri as madre di Teresa e Ivo

Maria Zanoli as madre di Liliana

Emma Baron as signora Renata