The purpose of this study was to examine the multiple mediating effects of positive self compassion and pain endurance on the relationships between adult attachment anxiety of early adulthood and psychological well-being. For the purpose, the data were collected from 560 adults aged 17 through 40. The questionnaires were consisted of attachment anxiety, psychological, positive self compassion and pain endurance. The main results were as follows. First, the direct effect of attachment anxiety on psychological well-being, pain endurance were found to be negatively significant. Additionally, the path from psychological well-being to positive self compassion and the path from psychological well-being to pain endurance were found to be positively significant. Second, the mediation effect of pain endurance was found to be significant in the relationship between attachment anxiety and psychological well-being. The results of this study are meaningful in that they comprehensively verified the structural relationship between positive self compassion and pain endurance in the relationship between attachment anxiety and psychological well-being. In addition, This study suggested the need for counseling intervention that enhances pain endurance in order to promote psychological well-being of people with attachment anxious.