Background: The experience of caring for cancer patients has adverse outcomes for family caregivers. The ability to care for a sick child is affected by the mother’s health; to empower mothers, it will be necessary to examine their caring ability. Objective: The aim of this study was to carry out a psychometric evaluation of the Caring Ability of Family Caregivers of Patients With Cancer Scale–Mothers’ Version (CAFCPCS–Mothers’ Version). Methods: The present study is a psychometric evaluation of the CAFCPCS–Mothers’ Version.