The determinansts of expenditure spent on medical care and the ratio of medical care spending to consumption expenditure were investigated using the 2002 House Income and Expenditure Survey by the Korea National Statistical Office, which consisted of a sample of 918 elderly households. There were significant differences in expenditure on medical care and the ratio of medical care spending to consumption expenditure between elderly and nonelderly households. Age, education, overspending were significant factors that determine the expenditure on medical care and the ratio of medical care spending to consumption expenditure. Overspending is the most important factor related to expenditure on medical care and the ratio of medical care spending to consumption expenditure.