Purposes: Family living with dementia patients have the burden for caring and suffer from health problems. Therefore, proper supports for their health disorders are required. The purpose of this study with regard to this is to subdivide unmet healthcare needs of family living with dementia patients into affordability, accommodation, and accessibility and figure out the relevant factors. Methodology: The 2017 Community Health Survey was used, and 2,331 families living with dementia patients was included. To figure out the factors with regard to the types of unmet healthcare needs, multinominal logistic regression analysis was conducted. Findings: According to the analysis result, sex, age, monthly household income, economic activity, self-rated health, self-rated stress and perception of depressive symptoms turned out to be the factors related to unmet healthcare needs. Regarding affordability, unmet healthcare needs were low when the object was female, over 65, highly educated, and monthly household income were high. On the other hand, unmet healthcare needs was high when self-rated health was bad, self-rated stress was high, and had depression. With regard to accommodation, unmet healthcare needs were low when the object was over 65. Unmet healthcare needs were high when the object was female, economically active and had depression, and self-rated health was high. Regarding accessibility, unmet healthcare needs were low when the object was high school graduate, but it was high when self-rated health was bad. Practical Implication: This study confirmed that the family with dementia patients had a high proportion of unmet healthcare needs due to affordability and accommodation. The existing main discussion was that the experience of unmet healthcare needs normally occurred due to economic reasons, but a consideration on various cases and factors is required to ultimately achieve the policy goal to reduce the unmet healthcare needs of the family living with dementia.