BACKGROUND: Indonesia has included stunting in one of the Sustainable Development Goals targets. Stunting is a chronic undernutrition status during growth and development since early life which is caused by multidimensional factors. Prevalence of stunting rate in West Nusa Tenggara (NTB) remains high. AIM: This study aimed to determine the implementing process to stunting prevention program in West Sumbawa’s Public Health Office, NTB Province, Indonesia. METHODS: This was qualitative research design using case studies where the researcher carefully investigated a program, event, activity, process, or group of individuals. The population in this study were all staff of the West Sumbawa’s public health office, health facilities, and pregnant women in West Sumbawa Regency (KSB), NTB with purposive sampling. The data analysis was thematic analysis with the Colaizzi method. RESULTS: Stunting Prevention Programs in 2019, there were 11 priority programs that were approved by the Government and Regional Apparatus Organization outpatient department of KSB, five priority programs for the locus stunting in Maluk district and 10 recommendation programs through the APBDes in KSB, and the flagship program in KSB was the Hearth. Based on local food (Kelor), the implementation of two programs from five priority programs in Mantun Village did not successful like optimizing parenting classes and alert village forums had less success as the inhibiting factors being the lack of participation of community human resources. The achievement of stunting prevalence reduction in KSB in 2018–2020 decreasing from 32.6% to 12.3% in NTB Province. CONCLUSION: Program launched by West Sumbawa’s Public Health Office in 2019 has been running and implemented with several important notes related to community participation and monitoring from agencies related to the program that has been launched by the government KSB.