The purpose of this study is to investigate the relationship between employees' Job Stress and Mental Health and their organizational climate as measured by the Morale Survey. Job stress may become a damage to employees' Mental Health, but there will be a set of third variables which work as moderators. The present study was conducted to examine how these variables influence the relationship between Job Stress and Mental Health based on their moderating effects. The questionnaire was composed of the following six measures: Morale Survey Questions, Organizational Environment and Awareness for Mental Health, Life Style and Stress Coping Activities (as moderator variables), Job Stress, and Mental Health. 1045 workers belonging to the different companies responded the questionnaire survey. Results of the analysis revealed the direct effect of Morale on Mental Health. And about the stress moderating effect of Morale Survey, Life Style and Stress Coping Activities, defferent patterns of influence were identified for each moderator.