["The Japanese Economic Review, EarlyView. ", "\nThis study uses Keio Household Panel Survey data to examine the effect of marriage on health. Based on the analysis, five key points are identified. First, respondents who get married have better initial health than those who remain single. Second, marriage improves several health indicators. Third, health improvements following marriage are a result of decreased smoking and improvements in mental health. Fourth, the effects of health improvements following marriage are larger for men than for women. Fifth, the sources of improved health following marriage differ between men and women.\n"]