This essay is focusing on the connection between insecure employment within temporary agency work and the psychological health in young adults and immigrants. Groups who are overrepresented as employees at the agencies. The employers responsibility for a safe work environment have also been analysed regarding the psychological health for the employees within temporary work agencies. Two questions have been answered to be able to investigate this; how the employers responsibility for a good organizational and psychological work environment meets the special needs of employees within temporary work agencies and how the psychological health in young adults and immigrants is affected by insecure employment. In this essay I used the jurisprudence method with focus on the doctrinal method since the written material is the main source of material which I connected to the sources of law. I have used both international and national law together with literature, reports, articles and electronic sources to give the essay an extensive ground to stand on. Finally, I reach the conclusion that the employers’ responsibility for a well-functioning organizational and psychological work environment for employees within temporary work agencies are inadequate. The explanation is that the general design of the contracts to which the employers and the customer companies enter into, usually makes the employers absent from the workplace which limit their ability to implement proper work adjustments for the employees.  Neither can the employer control which type of work that is available which makes it hard for the agency to make sure the employee can evolve within the job. The mutual responsibilities between the temporary work agency and the client company risk to put the employee in danger since some responsibilities easily can be neglected by both parties. When it comes to what kind of factors that have a negative effect on the young adults and immigrant’s psychological health because of insecure work I found that the main factors were; high expectations, few social relations to other employees and to not be able to control their own work. The factor of an insecure future was also found to have a negative effect.