The purpose of study is to study the influence of elderly's family harmony reflects on suicidal tendency among the mental health. The study was a survey of 323 elderly people aged 65 years or older in the elderly welfare center located in S city. The variables of this study consisted of the independent variable emotional intelligence, the dependent variable suicide tendency and the mediating effect family harmony. As a result of the study. In the mediating effect of family harmony on the influence of emotional intelligence on suicidal thoughts, it was found that emotional intelligence had a positive (+) effect on family harmony (t=9.389, p<0.001), and emotional intelligence was related to suicidal thought It was found to have a negative (-) effect (t=-7.358, p<0.001). The mediating effect, family harmony, had negative (-) influence on suicidal thoughts (t=-3.956, p<0.001), and emotional intelligence also showed that suicidal thoughts had negative (-) influence (t=-4.828, p<0.001). In Conclusions, it was found that family harmony had a partial mediating effect on the influence of emotional intelligence on suicidal thoughts. Emotional intelligence, which can accept one's own emotions and feel the emotions of others in the position of others, is an important variable for family harmony.