The thesis is focused on the analysis of selected ethical aspects in the book of Tobit. In the first part of the thesis explains the concept of ethics. In its second part individual ethical aspects of the book are explained. The third part tries to answer, what selected church documents and theological texts focused on ethics say about particular aspects analysed in the second part. At the end, particular events of the book of Tobit as ethical example for our lives and impact of Old Testament texts on present ethics are propounded to consider.