RÉSUMÉ
OBJECTIVE: To study midwives' experience in their role as a preceptor and their perception on how to best support midwifery students in obstetrics units. Obstetric units are an important learning area for student midwives but knowledge on how to become a good midwife preceptor is limited. DESIGN: This qualitative study explores midwife preceptors' experience of supervising midwifery students in three obstetric units in Sweden. Following ethical approval seventeen midwife preceptors were interviewed and data were analysed thematically. FINDINGS: Thematic analysis of the interviews resulted in the identification of two themes and five subthemes: (1) self-efficacy in the preceptor role which involves (a) being confident in the professional position and (b) having the support of management and colleagues and (2) supporting the student to attain self-confidence and independence which entails (a) helping the student to grow, (b) facilitating reflection in learning situations, and (c) "taking a step back". KEY CONCLUSION: Good preceptorship occurs when midwives achieve full self-efficacy, when they master the preceptor role, and when they have enhanced their abilities to help, the student reach confidence and independence. IMPLICATIONS FOR PRACTICE: Health care organisations needs to develop and support midwifery preceptorships.