This study aimed to examine the transition process of psychological independence and related factors throughout adolescence as perceived by university students using an interview survey. The participants were asked to rate their psychological independence on a scale of 1 to 10. Further, they were asked about the process of change in their level of psychological independence and the factors that influenced it. Consequently, the following eight items were obtained as factors influencing the process of transition to psychological independence: “working and social experience,” “presence of independent individuals around them,” “conflicts between parents and children,” “experience in positions that require responsibility and decision-making,” “broad interpersonal relationships,” “having a clear image of the future,” and “looking back on the past.” Notably, “the presence of independent individuals around them” and “looking back on the past” were new factors in this study. It is necessary to examine further how the presence of independent individuals around adolescents affects the promotion of their psychological independence. The study also showed multiple transition patterns in adolescents’ psychological independence, such as a gradual increase, early completion, and temporary stagnation.