Zbigniew Cybulski as Romek Brzozowski

Ryszard Filipski as Edek Słowik

Adam Fiut as Filip Janik

Mariusz Gorczyński as Rysiek Bednarek

Roman Polanski as Mały

Michał Szewczyk as Witek

Jadwiga Andrzejewska as Filip's Mother

Anna Ciepielewska as Danusia

Katarzyna Karska as Girl

Barbara Rachwalska as Mały's Mother

Ewa Zdzieszyńska as Halina

Jerzy Kozakiewicz as Karol

Józef Kalita as MO Lieutenant

Ryszard Lomnicki as MO Lieutenant

Janusz Majewski as Man buying theatre tickets from Mały (uncredited)

Tadeusz Ordeyg as Filip's Father (uncredited)

Wiesław Rutowicz as Delinquent at a Shooting Range (uncredited)