Vladimir Volodin as Karp Trofimovich Sidorenko

Mariya Mironova as Leokadiya Mikhaylovna

Rina Zelyonaya as Nastya

Vera Orlova as Tamara Vasilyevna Sperantova

Mikhail Kuznetsov as Pyotr Petrovich Sperantov

Georgi Millyar as Professor Utyatin

Emmanuil Geller as The druggist

Galina Stepanova as Evdokiya Ivanovna Sidorenko

Aleksandr Lebedev as Petya Sydorenko

Ivan Ryzhov as experienced fisherman

Aleksandr Zhukov as Alexander Ivanovich