The purpose of this study is to define the concept of the parents’ strengths and derive the constructed factors. To this end, a draft concept and the constructed factors were prepared by reviewing the literatures on the parents’ strengths, and the components of strengths necessary for the parents were explored and confirmed through a phenomenological study and a modified Delphi survey. After collecting the daily experience data that reconstructed activities and situations in which their parents’ strengths were expressed from 13 parents selected through an intentional sampling method, over 3 weeks, the components of the parents’ strengths were corrected through the in-depth interviews. Ten experts on parent education or positive psychology were selected as an expert panel, and a Delphi survey was conducted twice on the components of the parents’ strengths, and the content validity was secured by analyzing the mean, standard deviation, and the CVR values. According to the results, the parents’ strengths were consisted of the four factors of strengths related to growing, strengths related to building relationships, strengths related to problem-solving, and strengths related to contributing. Examining each sub-factor yielded what follows: 1) Strengths related to growing: Self-confidence, Introspection, Curiosity, Courage, Learning, Sincerity, Future-orientated, and Aesthetic, 2) Strengths related to building relationships: Love, Gratitude, Bonding, Accepting, Empathy, Expression, Individualization, and Caring, 3) Strengths related to problem-solving: Self-regulation, Flexibility, Deliberation, Insight, Resource utilization, Execution, Creativity, and Concentration, 4) Strengths related to contributing: Positive, Compassionate, Humorous, Vitality, Responsibility, Facilitating, Fairness, and Structuring. By identifying the definition of the parents’ strengths and their constituent factors, this study could contribute to the development of tools to measure the parents’ strengths and a strengths-based approach in the parenting education.