The purpose of this study was to verify whether there is a mediating effect of trust in the police in the relationship between citizens' voluntary contact with the police and the willingness to report. The data were collected through non-probability sampling and surveys targeting adults of Korean nationality residing in Seoul as of October 2020. For the analysis, SPSS 25.0 was used, the fit of the data and the correlation between variables were checked, and based on this, multiple regression analysis was developed. Finally, the Sobel test was conducted to verify the statistical significance of the mediating effect. As a result of the analysis, the influence of voluntary contact on the intention to report was indirectly effective, allowing the complete mediation effect of police trust to be recognized. Voluntary contact improves the willingness to report by enhancing police confidence. Considering that research results may vary depending on the type of police contact, this study attempted to conduct an in-depth analysis limited to voluntary contact. It is meaningful that the intention to report such as 'I will report', that is, the state of internal consent, was used as a variable to induce active participation in security activities.