This study attempted to verify the mediating effect of self object needs in the effect of self-concept clarity on relationship addiction. To this end, a survey was conducted on adult men and women, and a total of 260 copies (129 men and 131 women) were used for analysis. As for the research tools, the Self-Concept Clarity Scale (SCCS), Korean Self object Need Inventory(K-SONI), and the Relationship Addiction Questionnaire(RAQ) were used. As a result of the study, it was found that self object needs were completely mediated in the effect of self-concept clarity on relationship addiction. The mediating effects of self object-hunger and self object-avoidance, which are subfactors of SON, were also examined. As a result of the analysis, self object-hunger showed partial mediating effect in the effect of self-concept clarity on relationship addiction, and self object-avoidance showed complete mediating effect. As such, it can be seen that self object needs is a major variable affecting relationship addiction. This study attempted to provide predictable information on factors affecting relationship addiction revealed and to broaden the understanding of relationship addiction.