The purpose of this study is to verify whether the social support scale is a valid tool to measure the degree of social support for mothers with children suffering from cerebral palsy. Data were collected from 202 such mothers, and confirmatory factor analysis to verify the factor structure and exploratory factor analysis to determine the factor structure were performed. Rash analysis was conducted to determine the appropriateness of individual items, the degree of difficulty, and the suitability of the rating scale. It was found that the suitability of the four-factor structure presented in previous studies was not found through confirmatory factor analysis, and the bi-four factor relocating the items through exploratory factor analysis was proposed and the fitness of this model was confirmed through confirmatory factor analysis. The reliability analysis found that the reliability of the total questions as well as the sub-factors were found to be acceptable for Cronbach α at over 0.70. As a result of confirming the suitability of each item through Rash analysis, it was found that there were no inappropriate items, although there was a need to add items with high difficulty. After determining the suitability of the rating scale, the five-point Likert scale was found to be suitable for measuring social support. In future studies on social support for mothers with children suffering from cerebral palsy, it is imperative to analyze the results using the bi-four factor structure rearranged in this study.