This study is to test the relationship between job stress, social support and subjective well-being among security guard. 420 members of private security companies in Seoul were selected. Total 356 copies were picked up as the final sample. In conclusion, First, job stress among the private security guard have an effect on the social support. In other words, even though their role and personal relationship put them under a lot of stress, social support is high. while the more stress of duty they have, the lower social support is. Second, job stress among the private security guard have an effect on the subjective well-being. That is to say, the more stress of duty they have, the lower subjective well-being is. Third, social support has an effect on the subjective well~being. Namely, the more social support by neighbor and family is, the higher subjective well-being is. Forth, job stress has a direct or indirect effects social support and subjective well-being in meal or in malt.