Background and Objectives: Miss care is a quality index, which has been identified for nursing care and patient safety recently. However, no precise definition is available for the clinical dimensions and features of this concept. Thus, the present study aimed to analyze the concept of miss nursing care based on the hybrid model.Design: A concept analysis was conducted using a three-phase(theoretical phase, fieldwork phase and final analysis phase) hybrid method.Methods:In the theoretical phase, the concept of miss care was explored in reliable databases from 1998 up to 2018. Using COREQ guidelines ,in the field work phase, in-depth interviews were conducted with six nurses and the data were analyzed using content analysis method. In the last phase, the final analysis was carried out.Results: The results indicated miss care as a healthcare error as a kind of negligence in which the nurse provides unmanaged patient care due to the adversity of organizational and process background factors, which results in the negligence of essential cares and leads to consequences for both the patient and the nurse.Conclusion: Based on the present concept analysis, unmanaged care was the main feature of miss care, which had not been included in the previous definitions. Nurses can create an accurate structure for nursing care and reduction of miss care through performance of process-based care and determination of nursing care priorities. Further studies are recommended to compare this concept to similar ones to determine the clinical distinctions.