This research aims to analyze the effects on the Subject’s mental health of the Job Creation Project for the elderly in Japan. The subjects of this survey in 2007 were about 1500 participants in the Job Creation Project of Silver Manpower Center in Japan, 970 cases of whom were dataanalyzed.The results of this research are as follows:First, as a result of descriptive statistics of mental health, it was unders food that the average of total mental health is 2.91. As a result of verification of mental health difference, the score of mental health showed significant difference statistically according to job type or motivation of participation, and no significant difference statistically according to satisfaction with job project or duration of participation. With respect to job types, mental health is higher in desk job ormanagement/inspection or technical work than in simple work. Also among the motivations of participation mental health is highest for participation in society than for income.Second, a hierarchical multiple regression analysis was performed by including populationsociological properties variables and four subordinate variables of actual conditions of participation in the Job Creation Project for the Elderly in order to analyze the variables which influence the participant mental health. According to the result of analyzing the effects on total mental health, male gender and better physical health condition were seen to have positive effects on total mental health.It is noted that among the motivations of participation, participation in society, and satisfaction with the Job Project, had positive influence