This study proposes to compare the family function of disabled and non-disabled families byusing the McMaster FAD(McMaster Family Assessment Device). In order to compare sevensubdivisions of family function in a family with a disabled adult, a family with a disabled child, anda non-disabled family and reveal mutual relationships between the population-sociological featuresof the examinees and the subdivision of family function. I conducted MANOVA, which is ananalysis of multi-variables, and carried out correlation. The results are as follows: First, thedisabled family functions at a lower degree than the non-disabled family in general subdivisions offamily function, such as problem solving, communication, role, and behavior control, but did notfunction at a lower degree in the subdivision of emotional involvement. Second, a family with adisabled adult functions at a lower degree than a family with a disabled child, especially in the areasof behavior control, general function, role, and emotional response. Third, the correlation betweenthe general area of the disabled family and subdivisions of lowered family function corresponds tothe age of the disabled family member. The family functions at a lower level especially in role,emotional response, and behavior control. Fourth, the older the disabled family member becomes, thelower the family function, especially in regards to role, emotional response, and behavior control.Fifth, in the non-disabled family, higher family income results in lower family function. The olderthe respondents are, the higher the family function works. Likewise, a disabled family usually livesin a difficult situation, but close analysis shows many problems in family function. Accordingly, itis highly recommendable that the field of social welfare provides corresponding services byconsidering the above results.