In this study, we categorize the reasons for job satisfaction among psychological support professionals. We asked 81 clinical psychologists and clinical developmental psychologists about their job satisfaction using a 6-point scale ranging from “very satisfied” to “not satisfied at all,” and asked them to freely explain their reasons. Of the 81 participants, 67 (82.7%) were satisfied with their job and 14 (17.3%) were not satisfied. The reasons for job satisfaction are divided into three categories: “chance to exercise one’s abilities and growth,” “employment environment,” and “human relations.” “Chance to exercise one’s abilities and growth” has four subcategories: “rewarding/achievement,” “self-growth through work,” “sense of achievement at the desired job,” and “utilization of specialized skills.” The second category, “employment environment” has four subcategories: “work-life balance,” “flexible working style,” “salary/welfare,” and “employment status.” The third category, “human relations” has three subcategories: “existence of colleague psychological support professionals,” “good relationships” and “cooperation with other professionals.” The contents of each of these categories reveal much about the characteristics of clinical psychological support professionals.