The present study investigated the relations between job stress and organizational behavior. The subjects were 297 phamaceutical sales representatives (23 domestic company, 13 joint venture with multinational company). The major finding of the present study included that (1) pharnaceutical sales representatives experienced a high degree of stress from the salary, customers, and organizational support factors. Furthermore, sales representatives affiliated with the domestic company experienced greater stress, especially role overloads, relationships with the customers than the employee at the joint venture did. However, employee at the domestic company received higher social support from their seperios and/or co-workers. They· also revealed higher psychologcial tensions (depression, hostility) as well as somatic tension. With respect to their age, the juniors experienced more psychological & somatic tensions than the upper level managers did. An attempt was made to propose a model regarding the relations between job stress and stress related variables, and examine the goodness of fit between theoretical model and empirical data by the method of covariance structure analysis. The result of this analysis revealed that the proposed model was supported by a variety of indicators (GFI-.925, AGFI-.898, RMSR-.054). More specifically, 8 paths out of 12 paths were confirmed, although 4 paths were unconfirmed among 12 paths. Moreover, intention to turnover and collectivism/individualism variables were newly included in the present study, and 3 paths out of the newly proposed 5 paths were confirmed in the proposed direction. Interestingly enough, there was one newly confirmed path (7) which has been unconfirmed in previous studies, and another newly confirmed path which was shown to be the opposite direction in previous studies. The present findings suggested that additional field research be conducted to examine theoretical model proposed in the present study, and limitations for the present study were discussed.