The diploma thesis deals with the topic of quality of life in people with mental, respectively psychotic, diseases. It is a serious illness that affects all the personality and has a great impact on the quality of life. In the theoretical part is defined the concept of quality of life, its history, different angles of view and methods of measurement. Then you can find a detailed description of psychotic disease and life with it, and it is also more closely devoted to the quality of life of people with mental illness and its measurement. In the empirical part quantitative research is presented, whose aim is to determine which areas of life perceive people with psychotic illness as inferior to those without mental illness. Another aim is to find out whether social workers who work with people with psychotic illness at social housing shelter perceive the quality of life of these patientsin a different way than the patients themselves. The results obtained with the SQUALA subjective quality questionnaire show that these patients feel a lower quality of life in the area of health and close relationships than the general population. Furthermore, the results show that social workers are well aware of the quality of life of their clients with a psychotic illness, where they differ only in the area of...