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Elof Ahrle as Viktor Andersson, kallad Knatten |
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Alice Babs as Britt Forsberg |
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Bengt Logardt as Jan Löfgren |
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Åke Grönberg as Åke, basist |
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Marianne Gyllenhammar as Anne-Marie Beronius |
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Anders Börje as Anders Börje |
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Hilda Borgström as fru Löfgren, Jans mor |
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Douglas Håge as Britts far |
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Carin Swensson as Gullan |
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Nils Ferlin as Nils Ferlin |
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Sune Waldimir as Sune Waldimir |
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Eric Gustafson as direktör Rosenstam |
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Gustaf Lövås as rakbladsförsäljaren |
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Folke Hamrin as Hans |
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Britta Vieweg as fru Rosenstam |
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John Hilke as kriminalkommissarie |
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Lena Bergström as flickan i telefonväxeln |
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Hugo Jacobson as direktören med kassaskåpet |
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Pierre Colliander as klarinettisten |
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John Melin as vaktmästare på soarén |
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Bertil Berglund as turist vid stadsvisningen |
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Karl Kinch as kriminalkommissarie Jönsson |
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Stig Johanson as Olle, pianist |
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Erik Forslund as scenvaktmästare på Konserthuset |
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Nils Idström as civilklädd polis |
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Nils Larson as gitarristen på Britts studentskiva |
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Wilma Malmlöf as städerskan hos kassaskåpsdirektören |
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Irma Bergman as en kvinna på Anne-Maries fest |
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Jan-Olof Strandberg as ung man på Britts studentskiva |
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Kerstin Lokrantz as flicka på Britts studentskiva |
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Otto Adelby as man på kontoret där Knatten söker jobb |
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Sven Ericsson as lång man som lyssnar på rakbladsförsäljaren |
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Carl Andersson as rockvaktmästaren vid soarén |
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Harald Emanuelsson as polisen som frågar efter tillståndsbevis |
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Lillemor Appelgren as Berit, den lilla flickan vid soarén |
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Olle Hedberg as trumpetare |
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Karl Nilheim as violinist och klarinettist |
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Sven Hedberg as trombonist |
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Erik Fivel as altsaxofonist |
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Nisse Blücker as saxofonist |
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Carl-Henrik Norin as tenorsaxofonist |
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Bertil Frylmark as trumslagaren |
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Gösta Theselius as musiker som kommer ut på gatan |
| Sound | Lars Nordberg | Sound |
| Camera | Göran Strindberg | Director of Photography |
| Directing | Rut Rickardt | Script Supervisor |
| Production | Arthur Spjuth | Production Manager |
| Sound | Sune Waldimir | Music |
| Directing | Nils Idström | Assistant Director |
| Art | Alva Lundin | Opening Title Sequence |
| Art | Arthur Spjuth | Set Designer |
| Editing | Lennart Wallén | Editor |
| Sound | Sune Waldimir | Music Arranger |
| Production | Arthur Spjuth | Producer |
| Directing | Elof Ahrle | Director |
| Writing | Arthur Spjuth | Writer |
| Writing | Sven Forssell | Writer |
