Abstract The mental illness has increased sharply in the recent years and the focus on the psychosocial work environment has become more and more important. Today, the physical working environment is not the only thing that matters, the psychosocial work environment has taken more space and become a part of the labor environment law. The purpose of this work is to see how the concept of psychosocial environment law and mental health is regulated and worked with in the municipality of Jönköping, to gain a better understanding of how legal texts and rules apply in working life. Since the work is based on the regulations of Arbetsmiljöverket, the legal methodology is used to the greatest extent. The method is very similar to the traditional legal dogmatic method but provides little room for analysis. However, the legal sociological method will also be used to investigate what psychosocial work environment impact the employees. Psychosocial labour environment is very important for workers not to suffer from ill health. Various factors enter the psychosocial work environment that can contribute to psychological ill health. Stress, demands and uncomfortable working hours are just a few. The concept of psychosocial work environment is now included in the labour environment law and its regulations. There is, however, no indicative case law in this area. More research and more knowledge in the psychosocial labour environment is required for mental health to stop increase. Unfortunately, it is difficult to make the law more general, since each case in mental health is unique.