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Pulmonary tuberculosis is a serious problem in Indonesia. In addition to having a high risk of transmission, it's treatment encounters many barriers, such as the length of treatment, large number of medicine, and adverseeffects. Thus, it is important to identify the transmission prevention behavior in pulmonary tuberculosis patients. This research aims to explore the pulmonary tuberculosis transmission prevention behavior in pulmonary tuberculosis patients in the working area of Binamu Community Health Center. This research was a qualitative research with a phenomenological approach. The method used was in-depth interviews with six pulmonary tuberculosis patients by means of purposive sampling technique. The findings revealed that the tuberculosis transmission prevention behavior in pulmonary tuberculosis patients was still lacking, for examples, the lack of knowledge about tuberculosis, transmission prevention through proper separation of eating and drinking utensils, transmission prevention through contact restrictions at the same house was still low, poor coughing and sputum etiquette, and incompliance with mask-wearing behavior at home. This research recommended providing more education about tuberculosis on an ongoing basis to patients and conducting regular home visits to TB patients’ houses to evaluate the actions that have been recommended by health workers.