Background : Health Advocacy (HA) is an important competency for physicians, but education in this area remains underdeveloped in Japan. This study aimed to qualitatively analyze the educational effects of the Child Advocacy Training (CHAT) program designed for pediatric residents in Japan and to derive implications for future educators.　Methods : Semi-structured interviews were conducted with six pediatric residents who participated in all sessions of CHAT after program completion. The obtained transcripts were analyzed using thematic analysis.　Results : Three categories and 12 themes were extracted : “Deepening of Conceptual Understanding,” “Expansion and Quality Improvement of Practice Content,” and “Expansion of Considerations for Practice Environment.” Participants demonstrated long-term understanding of HA concepts, acquired the ability to systematically combine HA methods, and developed changes in their practical environment. Additionally, they gained perspectives on educational recall and educational expansion.　Discussion : Through CHAT learning, participants not only acquired superficial HA knowledge and skills but were also confirmed to engage in self-reflection and form new values or reconstruct existing ones, suggesting the possibility that CHAT promotes the experiential learning cycle.　Conclusion : The CHAT program may promote awareness and behavioral transformation related to the HA role and serve as a foundation for developing practical HA competencies through experiential learning cycles.