Purpose: This study was conducted to understand the relationships between mental health, level of depression, and internet addiction among elementary school students in a rural area. Methods: The survey was carried out on a convenience sample of 212 elementary school students during May of 2008. Results: In results, There were 17.5% of risk group of mental health level, 12.6% of depression level, and 2.8% of internet addiction among subjects. It represents statistically significant positive correlation between depression level and internet addiction. Conclusion: In conclusion, there were considerable numbers of risk group in mental health and depression level among elementary school students. Therefore, the development of mental health program for preventing depression and internet addiction should be needed.