Objectives: The purpose of this study was to investigate the factor contributing to loneliness of children in lower income class and to examine the relationship of the variables. Methods: The participants were 178 children in lower income class. Data were collected from April to May, 2018 by taking a self reported survey and analyzed using descriptive statistics of a mean±SD, Pearson’s correlation coefficient, and hierarchical regression analysis with SPSS 25.0 program. Results: The mean score of loneliness was 37.02±8.05 out of a 3 point scale, slightly lower the half. There were negative correlations between loneliness and allowance per month, double income couple, perceived atmosphere, and both parents’ supervision and positive correlation between loneliness and both parents’ abuse and neglect. Variables such as allowance, double income, mother’s supervision and abuse explained 36.8% of children’s loneliness. Conclusions: There is a need to develop parental educational programs to evaluate the parenting attitude for decreasing the level of children’s loneliness.