Objective: This study aimed to clarify clinical nurses’ perceptions of effective teamwork.Method: Semi-structured interviews were conducted with 13 nurses working in general wards. The contents of interviews were analyzed descriptively and qualitatively.Results: Clinical nurses are Making arrangements so that the team can work smoothly, Supporting one another’s work, and Acting in a way that allows other members to work easily. They also learn teamwork from Learning teamwork in team practice and Learning teamwork through activities by interprofessional collaboration. When these activities become Realizing the result of care by the team, they can feel effective teamwork.Conclusion: To have effective teamwork, it is crucial to share among team members the goal of providing quality care, to reflect on the practice from the viewpoint of effective team work, and to learn by associating the experiences of teamwork with actions to be taken as a team member.