Covid-19 is a virus that transmits rapidly from one person to another, one of which is in public facilities such as traditional market. This study aims to analyze factors related to mask use obedience behavior on traders and buyers in the Mongging Market Based on the Health Belief Model. This is a quantitative study using a cross-sectional method. Traders and buyers made up the sample in this study, with a total of 125 respondents who agreed to be used as research samples by filling out research questionnaires and conducted analyze with fisher exact alternatives and spearman test. The result show that factors have significant relationship with excellent and correct adherence to wearing masks is perceived susceptibility (p-value = 0.000), perceived severity (p-value = 0.000), perceived benefits (p-value = 0.000), perceived barriers (p-value = 0.000), cues to action (pvalue = 0.000), perceived threat (p-value = 0.000), and gender (p-value = 0.000). While age (p-value = 0.159), recent education (p = value = 0.104), income (pvalue = 0.909) and self efficacy (p-value = 0.217) are not significant relationship with excellent and correct adherence to wearing masks on traders and buyers in the Mongging Market.