Interpersonal relationships of prisoners are of key importance from the aspect of their reintegration. We focus our attention on non-kin, primarily friendship ties on a sample of young Hungarian males convicted for the first time, for a relatively short period of up to 3 years. In our longitudinal qualitative research, 80 offenders from eight penal institutions were interviewed while serving their sentence and 31 of them could also be reached 6 months after they left the prison. We analyse what significance prisoners attribute to their friendship ties, how these change during the prison sentence, which factors influence their sustainment or dissolution, weakening or strengthening.