Евгений Буренков
— Degtyarev
Нина Дорошина
— Liza
Валентина Владимирова
— Varvara Nikolaevna
Владимир Гусев
— Sakharov
Татьяна Пельтцер
— teacher
Stanislav Lykhin
— Borya
Alla Gutchina
— Nadya
Георгий Вицин
— geometry teacher
Aleksandr Vasilyev
— Makar
Николай Новлянский
— Nikolai
Галина Самохина
— member of the construction team
Евгений Шутов
— Viktor Nikolayevich
Дима Успенский
Серёжа Смирнов
Витя Стульчиков
Виталий Балагуров
— (uncredited)
Борис Баташев
— (uncredited)
Igor Beziaïev
— member of the construction team (uncredited)
Константин Ерофеев
— (uncredited)
Клавдия Козлёнкова
— member of the construction team (uncredited)
Алексей Крыченков
— Kostya Fomin (uncredited)
Александр Лебедев
— member of the construction team (uncredited)
Владимир Лебедев
— (uncredited)
Galina Malinovskaya
— (uncredited)
Георгий Милляр
— passerby (uncredited)
Артур Нищёнкин
— builder (uncredited)
Вера Петрова
— Valya (uncredited)
Надежда Самсонова
— (uncredited)
Nikolaï Smirnov
— builder (uncredited)
Галина Соколова
— (uncredited)