In line with self-determination theory and psychological well-being theory, we examine the effects of career-counseling self-efficacy (CCSE), self-esteem, and leader-member exchange (LMX) on well-being via the satisfaction of the three psychological needs (PNs). Using a cross-sectional design, we submitted an online questionnaire to 235 school counselors' psychologists working in French public counseling centers. The results showed that satisfaction of the PN for autonomy mediated the links between CCSE, self-esteem, and LMX as explanatory variables and well-being as a resultant. Satisfaction of the PNs for autonomy mediated the links between LMX, CCSE, and self-esteem as inducers, and well-being as a criterion.