This essay takes its starting point in the fact that job strain, high demands in combination with low control, has an impact on the risk for employees to be afflicted to a cardiovascular disease. Therefore, the aim of the study is to examine what responsibilities the employer, through the regulation, is imposed to prevent the risk for unhealthy workload for employees. The study was made doable through the legal method that enables a combination of science and legislation and that is characterized of a free argumentation. The method has been complemented with a gender perspective, a physiological perspective and a European legal perspective. Used material is except regulations on the working environment, also literature and other relevant studies and also some statistic. The research question has been: In what ways are the employers obligations regulated in AFS 2015:4 to resist unhealthy workload and which support is the prescription given to the relevant paragraph’s in Arbetsmiljölagen (1977:1160)? To sum up the answer, the employer has an extensive responsibility to include, investigate and inform the employees about unhealthy workload. Trough the regulation AFS 2015:4 makes the regulation about workload in Arbetsmiljölagen (1977:1160) more clear.