The article concerns the issue of code switching, which I noted in two idiolects of persons resettled from the former eastern provinces of the Second Polish Republic to the Lubusz region. In obtaining and developing the material, I used the methods: snowball sampling, biographical interview, language biography and grounded theory. I presented the explanation of the term for code switching, taking into account Polish and world literature. I presented some examples of code switching and I made their sociolinguistic analysis.