been a radical change in the lifestyle and way of living of human beings. Rising living standards and changing lifestyles include the way a person works, his growing needs and the time and effort he puts into the work to be done at the workplace to meet those needs. As a result of which the time given for the work to be done for job satisfaction has also started taking less time for the person. A person has started wanting to do more than one work at a time to fulfill his needs, due to which the problem of job stress has also started at his workplace, which affects the work being done by him and his performance towards his work. The objectives of our study were to find out the impact of Job stress on Mental and Health Wellbeing and to find out relation between job stress and employee work performance. Self-designed questionnaire was used. Reliability Test, Factor Analysis, One-way ANOVA and Regression tools were used for data analysis. We concluded that job stress impact on mental and health wellbeing and work performance of employees in service sector organization.