Sports facility workers in Japan are exposed to mental health risks due to the demand of jobcharacteristics and job insecurity due to many temporary workers. The purpose of this study wasto clarify the characteristics of mental health of Japanese sports facility workers, using the NewBrief Job Stress Checklist. The survey was conducted on 488 workers in the capital area sportsfacilities in Japan, among which 378 valid respondents (183 office staffs and 195 instructor staffs)were grouped and data were analyzed. The survey included Job stress measured by the New BriefJob Stress Questionnaire, and Mental health measured by General Health Questionnaire. To examineassociations between job stress and mental health, χ2 test, t-test and linear regression analysesmodels were conducted. As a result, the two groups showed different job stress factors.(1) Office staffs showed better status in terms of qualitative and physical demand than instructorstaffs, and the instructor staffs showed better status in terms of application of skill, job insecurity,and meaning of job.(2) Instructor staffs showed a better mental health status. For office staffs, the quantitative demand,job control, meaning of job, and job insecurity had a significant relationship with mental health. Forinstructor staffs, the physical demand, interpersonal relationships, job insecurity had a significantrelationship with mental health.