This study is to classify the factors having an influence on the intention to change jobs of social workers in the social welfare institutions by sociology of population features, work environment factors, personal characteristic factors and external environmental factors, based on the previous studies, and analyze how these factors affect the intention and also which factors affects the decision the most. The results are as follows. There are significant differences in the intention to change jobs according to the sociology of population features. And the intention to change jobs is higher if social workers have less chance to participate in making a decision, worse relationships with their supervisors, worse work environment factors, and higher role conflict, in work environment factors, when social workers perform their duties in the organization. And the intention is higher if self-esteem, achievement motivation and leadership are lower in personal characteristics factors. In external environmental factors, social workers have higher intention to change jobs if social support is lower. And there was no correlation between compensation satisfaction and easiness to change jobs. Achievement motivation, relationship with colleagues and bosses and role conflict are especially relevant the most, showing a high correlation coefficient. Also regression analysis shows that achievement motivation and role conflict are important factors to affect the intention to change jobs.