In this thesis, I analyse how the rights of undocumented migrants are understood and represented by different actors, such as politicians, public sector representatives, and Finnish scholars, in Finnish newspapers between 2015-2019. I conduct an argumentation analysis of secondary source news articles, drawing on a theoretical framework of Differentiation Theory and Social Constructivist Approach. This study identifies some key factors, which have contributed to the construction of an unclear understanding of undocumented migrants' rights. My results show that the identified factors have inter alia, led to significant municipal differences in the provision of rights. I argue that due to various factors, the understanding and representation of the rights of undocumented migrants differ widely, thus creating ambiguity to the overall understanding. The findings contribute to earlier research made on the rights of undocumented migrants in Finland as it examines how the rights are understood and represented and could potentially be employed both in policy development and understanding the concept itself.