Independence is, as often said, one of the most important factors in child's personality development, and of the most interesting subjects in the field of child's growth. In this report on child's independence, two subjects were studied. One was to analyze the factors of independence of 8 & 9-year-old from their replies to the questionnaire developed by the author mainly referring to the “Diagnostic Test of Independence (D.T.I.)”. The questionnaire included 45 items with a 4-point scale for responses. The second subject was to find correlation between the factors of ‘independence’ and ‘causal attribution’ measured with Kambara et. al. Causal Attribution Scale for lower grade primary school children. These two scales were distributed to 136 third-graders. As a result, the following six factors of independence were extracted: 1. Self-decision-making, 2. Autonomous life style, 3. Spontaneous self expression, 4. Decision for action, 5. Steady life style, 6. Challenging. It was also found that a relation between ‘independence’ and ‘causal attribution’ was most distinct with factors No.4 and No.6.